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Longman Dictionary of Contemporary English
radical
I.adjective
COLLOCATIONS FROM OTHER ENTRIES
dramatic/drastic/radical (=very big, especially in way that is surprising)
▪ The Industrial Revolution was a period of dramatic change.
free radical
▪ It is thought that free radicals can damage cells.
radical reform (=very big and important changes)
▪ His government adopted a policy of radical reform.
COLLOCATIONS FROM CORPUS
■ NOUN
group
▪ Yet, the style of Samson is fundamentally different from those texts associated with the writing of popular radical groups.
▪ Incidents such as this one were commonly reported by military intelligence as evidence of black ties with radical groups.
▪ Buhle must point the finger at the other radical groups.
politics
▪ She was untainted by the radical politics of earlier reformers and wisely avoided the tendentious macro-economics of the Neo-Malthusians.
▪ His previous interests have been science fiction and drugs, and I suspect his present passion for radical politics will pass.
▪ The radical interconnectedness of culture is redeemed for a radical politics, and via transgressive reinscription.
▪ Despite his success, the senate objected both to practical training and to Stuart's radical politics.
▪ More remarkably, George Stephen was virtually silent on the later antislavery commonly associated with aspects of radical politics and militant nonconformity.
EXAMPLES FROM OTHER ENTRIES
Radical differences within the group began to appear.
▪ a radical leftist group
▪ He recommended a radical change in her diet.
▪ It was an incredibly radical decision.
EXAMPLES FROM CORPUS
▪ But the combination, the combination of visionary stuff and radical politics: that troubled me.
▪ Can it avoid self-destruction caused by the strong ideological differences among its moderate and its more radical factions?
▪ It is instructive to recall that the cause of conservation was conservative before it was ever radical.
▪ It was' 68, and we were both, you know, radical, and civil rights, and feminism.
▪ She hunted stereotypes down as if they were sewer rats and stuck radical slogans to the fridge door.
▪ The goals of this movement were to seek minimal economic improvements while preventing campesinos from looking for more radical solutions.
▪ Within the living memory of the older inhabitants of Dornie, there have been radical changes affecting both these waterways.
▪ You give too much publicity to radical oddballs....
II.noun
COLLOCATIONS FROM CORPUS
■ ADJECTIVE
free
▪ It's believed that pollution can form substances in our body known as free radicals which speed up ageing.
▪ Two hot areas: products for dieters and antioxidants, which are thought to neutralize so-called free radicals that can damage cells.
▪ The mechanism of the process is brought about by the initial ionisation of water and the subsequent production of free radicals.
▪ Left to their own devices, these free radicals cause tissue damage.
▪ Reduced glutathione is known as a major low molecular weight scavenger of free radicals in cytoplasm.
▪ The ones of interest here are a highly reactive chemical species called free oxygen radicals.
▪ However, the products obtained from reactions with halides can be rather surprising - ie the dithiadiazole can trap free radical intermediates.
▪ So could malaria parasites be destroyed by assaulting them with free oxygen radicals?
political
▪ Millionaires are unlikely to be social or political radicals.
▪ However, psychological, personality-based approaches have also been used to account for the behavior of political radicals.
young
▪ By the early nineties a significant proportion of young radicals had adopted Marxist ideas.
▪ This was particularly the case on college campuses, where the young radicals of the New Left dominated public debate.
▪ From the early 1890s Marxism caught on among young radicals with remarkable speed.
▪ Tom Hayden recalled the foment in Chicago 28 years ago that propelled him as a young radical into the national spotlight.
▪ Lots of young radicals see Orwell as part of the cold-war anti-Communist gang.
■ NOUN
student
▪ Much of the empirical research has examined student radicals.
▪ As some one who has experience with other students, what do you hypothesize about the student radicals?
▪ Are student radicals of the left different from student radicals of the right?
EXAMPLES FROM CORPUS
▪ A final recommendation of the consultants was a radical attempt to forge a closer working relationship between the board and staff members.
▪ Her verbal spontaneity ruffled far too many feathers even if it attracted admiration from thousands of radicals and feminists.
▪ Millionaires are unlikely to be social or political radicals.
▪ Prime Minister Stolypin was murdered by radicals in 1911.
▪ Suddenly the confidence of the new radicals received a body blow.
▪ The Duma, packed by radicals, was dissolved by the Tsar in 1906.
▪ Unless it would be for wealthy men interested in acquiring as trophy wives lapsed radicals who look great in workout gear.
▪ With no real power-base of his own, he was one of the first radicals to suffer disgrace.
The Collaborative International Dictionary
radical

Residue \Res"i*due\ (r?z"?-d?), n. [F. r['e]sidu, L. residuum, fr. residuus that is left behind, remaining, fr. residere to remain behind. See Reside, and cf. Residuum.]

  1. That which remains after a part is taken, separated, removed, or designated; remnant; remainder.

    The residue of them will I deliver to the sword.
    --Jer. xv. 9.

    If church power had then prevailed over its victims, not a residue of English liberty would have been saved.
    --I. Taylor.

  2. (Law) That part of a testeator's estate wwhich is not disposed of in his will by particular and special legacies and devises, and which remains after payment of debts and legacies.

  3. (Chem.) That which remains of a molecule after the removal of a portion of its constituents; hence, an atom or group regarded as a portion of a molecule; a moiety or group; -- used as nearly equivalent to radical, but in a more general sense.

    Note: The term radical is sometimes restricted to groups containing carbon, the term residue and moiety being applied to the others.

  4. (Theory of Numbers) Any positive or negative number that differs from a given number by a multiple of a given modulus; thus, if 7 is the modulus, and 9 the given number, the numbers -5, 2, 16, 23, etc., are residues.

    Syn: Rest; remainder; remnant; balance; residuum; remains; leavings; relics.

Douglas Harper's Etymology Dictionary
radical

late 14c., in a medieval philosophical sense, from Late Latin radicalis "of or having roots," from Latin radix (genitive radicis) "root" (see radish). Meaning "going to the origin, essential" is from 1650s. Radical sign in mathematics is from 1680s.\n

\nPolitical sense of "reformist" (via notion of "change from the roots") is first recorded 1802 (n.), 1817 (adj.), of the extreme section of the British Liberal party (radical reform had been a current phrase since 1786); meaning "unconventional" is from 1921. U.S. youth slang use is from 1983, from 1970s surfer slang meaning "at the limits of control." Radical chic is attested from 1970; popularized, if not coined, by Tom Wolfe. Radical empiricism coined 1897 by William James (see empiricism).

radical

1630s, "root part of a word, from radical (adj.) Political sense from 1802; chemical sense from 1816.

Wiktionary
radical

a. 1 Favoring fundamental change, or change at the root cause of a matter. 2 (context botany not comparable English) Pertaining to a root (qualifier: of a plant). 3 Pertaining to the basic or intrinsic nature of something. 4 thoroughgoing. n. 1 (context historical: 19th-century Britain English) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism). 2 (context historical: early 20th-century France English) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics. 3 A person with radical opinions. 4 (context arithmetic English) A root (of a number or quantity). 5 (senseid en linguistics: portion of a character that provides an indication of its meaning)(context linguistics English) In logographic writing systems as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning, as opposed to '''phonetic'''. 6 (context linguistics English) In Semitic languages, any one of the set of consonants (typically three) that make up a root. 7 (context chemistry English) A group of atoms, joined by covalent bonds, that take part in reactions as a single unit. 8 (context organic chemistry English) A free radical.

WordNet
radical
  1. adj. (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative" [syn: extremist, ultra]

  2. markedly new or introducing radical change; "a revolutionary discovery"; "radical political views" [syn: revolutionary]

  3. arising from or going to the root; "a radical flaw in the plan"

  4. of or relating to or constituting a linguistic root; "a radical verb form"

  5. especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem; "basal placentation"; "radical leaves" [syn: basal] [ant: cauline]

radical
  1. n. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule [syn: group, chemical group]

  2. an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells" [syn: free radical]

  3. a person who has radical ideas or opinions

  4. a character conveying the lexical meaning of a logogram

  5. a sign placed in front of an expression to denote that a root is to be extracted [syn: radical sign]

  6. (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem" [syn: root, root word, base, stem, theme]

Wikipedia
Radical

Radical may refer to:the atom or group of atom having either positive or negative charges and behaves as a single during chemical combination

Radical (Smack album)

Radical is the Finnish rock band Smack's fourth and last studio album. It was released in 1988.

Radical (book)

Radical: Taking Back Your Faith from the American Dream is a 2010 Christian book written by David Platt, and is a New York Times Bestseller.

Radical (mixtape)

Radical is a mixtape by the alternative hip hop collective, Odd Future. It was released on May 7, 2010. The mixtape features Odd Future members Tyler, The Creator, Hodgy Beats, Left Brain and Jasper Dolphin, as well as newly introduced members Earl Sweatshirt, Domo Genesis, Mike G and Taco rapping over some of their favorite beats.

Matt Martians, Frank Ocean and Syd tha Kyd, are the only musical members of Odd Future, who didn't appear on the mixtape. However, Sydney was involved in the recording and mastering process and contributes brief vocals on the track "Swag Me Out".

Radical (film)

Radical is an upcoming action/thriller film starring Tom Sizemore. Filming took place in Hollywood.

Radical (Chinese characters)

A Chinese radical is a graphical component of a Chinese character under which the character is traditionally listed in a Chinese dictionary. This component is often a semantic indicator (that is, an indicator of the meaning of the character), though in some cases the original semantic connection has become obscure, owing to changes in character meaning over time. In other cases, the radical may be a phonetic component or even an artificially extracted portion of the character.

The English term "radical" is based on an analogy between the structure of characters and inflection of words in European languages. Radicals are also sometimes called "classifiers", but this name is more commonly applied to grammatical classifiers (measure words).

Radical (chemistry)

In chemistry, a radical (more precisely, a free radical) is an atom, molecule, or ion that has unpaired valence electrons. With some exceptions, these unpaired electrons make free radicals highly chemically reactive towards other substances, or even towards themselves: their molecules will often spontaneously dimerize or polymerize if they come in contact with each other. Most radicals are reasonably stable only at very low concentrations in inert media or in a vacuum.

A notable example of a free radical is the hydroxyl radical (HO•), a molecule that has one unpaired electron on the oxygen atom. Two other examples are triplet oxygen and triplet carbene (:) which have two unpaired electrons. In contrast, the hydroxyl anion is not a radical, since the unpaired electron is resolved by the addition of an electron; singlet oxygen and singlet carbene are not radicals as the two electrons are paired.

Free radicals may be created in a number of ways, including synthesis with very dilute or rarefied reagents, reactions at very low temperatures, or breakup of larger molecules. The latter can be affected by any process that puts enough energy into the parent molecule, such as ionizing radiation, heat, electrical discharges, electrolysis, and chemical reactions. Indeed, radicals are intermediate stages in many chemical reactions.

Free radicals play an important role in combustion, atmospheric chemistry, polymerization, plasma chemistry, biochemistry, and many other chemical processes. In living organisms, the free radicals superoxide and nitric oxide and their reaction products regulate many processes, such as control of vascular tone and thus blood pressure. They also play a key role in the intermediary metabolism of various biological compounds. Such radicals can even be messengers in a process dubbed redox signaling. A radical may be trapped within a solvent cage or be otherwise bound.

Until late in the 20th century the word "radical" was used in chemistry to indicate any connected group of atoms, such as a methyl group or a carboxyl, whether it was part of a larger molecule or a molecule on its own. The qualifier "free" was then needed to specify the unbound case. Following recent nomenclature revisions, a part of a larger molecule is now called a functional group or substituent, and "radical" now implies "free". However, the old nomenclature may still appear in the literature.

Usage examples of "radical".

Such treatment by the authorities soon led some socialist leaders to despair of ever achieving their goals by parliamentary means and to embrace more radical ideologies, such as syndicalism and anarchism.

Programs on supersonic reaction initiation, free radical mechanisms, photocatalysis, and selective adsorption would be quietly, even surreptitiously, phased out.

As a profoundly mystical and religious mind, he was repulsed by the agnosticism of the radicals.

The difference between him and an Apologist like Tatian seems here to be a radical one.

Not even the most radical of the young dremecks would kill an arachnid if it crawled down his neck.

The young doctor, who was gentleness personified, begged me to come and stay with him, promising that his mother and sisters should take the greatest care of me, and that he would effect a radical cure in the course of six weeks if I would carry out all his directions.

Hazzard was to them the little Radical among the Tories, or the atheist in bishopdom, or the fellow who did not go to the inter-hospital rugger matches and shout.

Kathy Boudin, two members of the sixties radical group Weather Underground, who have been in prison for more than twenty years for their part in a 1981 robbery of a Brinks truck that left two policemen and a guard dead.

And because his parents were in prison, Chesa Boudin was raised by two other members of the radical group, Bernadine Dohrn and Bill Ayers.

I had already answered that she could not get rid of the pimples on her face in less than a week, but that a year of diet would be necessary to effect a radical cure.

The teachers of classic criminology, who had taken kindly to the recommendations of Pessina and Ellero, urging them to study the natural sources of crime, met the new ideas with contempt, when the new methods made a determined and radical departure, and became not only the critics, but the zealous opponents of the new theories.

No Licinius Crassus had ever been apostrophized as a demagogue or any other sort of political radical, so what was Catulus prating about?

He came back with a course of action, admittedly radical, and sent Ben back to River Bend to fetch the farrier and Dobie to the welder in the machine shed with a hastily sketched diagram of the splint he wanted made.

Johnson evidently set out with the full intention not merely of retaining the Cabinet of his predecessor, not merely of co-operating with the party which elected him, but of espousing the principles of its radical, progressive, energetic section.

Ever since the revolutionary days of 1905-6, Professor Milyukov has been playing a most conspicuous part in the Russian emancipatory movement, as the leader of the Constitutional party, as a Duma deputy and the editor of the influential radical newspaper Ryech.