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Longman Dictionary of Contemporary English
optical
adjective
COLLOCATIONS FROM OTHER ENTRIES
optical character recognition
optical fibre
optical illusion
optical properties
▪ These minerals have similar optical properties.
COLLOCATIONS FROM CORPUS
■ NOUN
character
▪ This can be on-line or off-line recognition of hand-printed characters, or of machine-printed characters using optical character recognition.
▪ This could include word processing, a database, case management and optical character recognition.
▪ It is distinguished by an X-Windows/Motif interface, and its ability to integrate with optical character readers and document processors.
▪ One example is the method of recognition using template matching which is applied in both speech recognition and optical character recognition.
▪ Another growing use for scanners is as optical character readers.
density
▪ Even fraction of a second, the optical density of the nucleus is measured and stored in the computer's memory.
disc
▪ The large memory requirements suggest the use of optical disc storage.
▪ Moreover, these market figures only take account of multi-media delivered on a stand-alone optical disc platform.
▪ Today, portable optical disc players are also emerging.
disk
▪ Once documents have been scanned and indexed, they have to be saved to optical disk.
fibre
▪ It also explains why it is virtually certain that Britain's main trunk lines will rely on optical fibre.
▪ You will also need a length of optical fibre.
▪ An optical fibre uses total internal reflection to carry a light beam over long distance and around corners.
▪ It is interesting to examine the optical fibre before using it in the communications system.
▪ IskraTEL specialists are currently laying optical fibre cables to connect the city's exchanges.
▪ Next came an all-optical experiment using an optical fibre as nonlinear medium { 32 }, demonstrating 12 and chaos.
▪ The obstacle to optical fibre communication is lift loss due to impurities in the glass.
▪ It is not the purpose here to explain exactly how an optical fibre works in terms of total internal reflection.
fibres
▪ In telecommunications, optical fibres made of glass will gradually replace the traditional copper cables in new equipment.
▪ Mrs Thatcher's panel of advisers recommend against linking homes with optical fibres on the grounds of cost.
▪ The comparable figure, it said, for optical fibres was nearly £2000.
▪ But lasers have snags: even with optical fibres, lasers can not reach every part of the body.
▪ In their report, the prime minister's advisers did not come out against optical fibres altogether.
▪ Despite the cost, Telecom is now irrevocably committed to optical fibres in all its new telephone speech and data trunk lines.
▪ The recent enthusiasm for optical fibres is the result of dramatic advances in optical purity.
▪ The company has been adept at moving into high-margin businesses such as laboratory services, optical fibres and speciality materials.
illusion
▪ For once, the optical illusion experienced by sailors leaving port seemed apt.
▪ This is called an optical illusion, which means that your eyes trick you into seeing something that is not really there.
▪ Shiseido's Wrinkle Smoothing Concentrate works on the principle of an optical illusion.
▪ Even better, the full Coliseum will not be an optical illusion.
▪ It was probably an optical illusion, but the place seemed to be flying more eagles and swastikas than stars and stripes.
▪ Most argued that the canals were optical illusions, and that Mars was a cold, waterless, radiation-baked world.
▪ This is an optical illusion in which the diagram of a skeleton cube appears to the observer in either of two orientations.
▪ Even knowing what he did, Kirov found it difficult to see how the optical illusion had been managed.
instrument
▪ The first questions Wien asked were related to the resolving power of optical instruments.
▪ Even optical instruments, such as perspective machines, the cameraobscura and the camera lucida, were used sparingly.
▪ This level of magnification shows the eye as an optical instrument.
▪ There is, however, one classical restriction which we must take into account, namely the resolving power of optical instruments.
microscope
▪ However, the dimensions of the smallest circuit-parts will soon have shrunk beyond the limit that optical microscopes can resolve.
▪ To be seen clearly under an optical microscope, cell tissues often have to be stained to increase contrast.
▪ In his own private laboratory, he worked with ultraviolet radiation at the ultimate resolution of the optical microscope.
property
▪ For example, distinction between calcite and dolomite is difficult because they have similar optical properties.
▪ Many rocks are composed of a high proportion of echinoderm debris, which is easily recognized because of this optical property.
▪ Indeed, their optical properties reflect a non-biological origin.
▪ She remained there for four years, during which time she conducted researches on the optical properties of organic compounds.
▪ This absorption band comes from the spherical geometry of the particles and the particular optical properties of the gold.
system
▪ In the optical system two slotted discs fitted to the end of the rollers.
▪ The latter show promise in optical system implementations.
▪ Again there are various optical systems.
EXAMPLES FROM OTHER ENTRIES
Optical bar-code scanners have revolutionized the postal system.
optical distortions caused by poor quality lenses
▪ They sell optical equipment such as cameras and telescopes.
EXAMPLES FROM CORPUS
▪ But lasers have snags: even with optical fibres, lasers can not reach every part of the body.
▪ Consider a photon which is polarised parallel to the optical axis of P,.
▪ For this reason the phase control signals to these upper base drives are often transmitted via a stage of optical isolation.
▪ However, the dimensions of the smallest circuit-parts will soon have shrunk beyond the limit that optical microscopes can resolve.
▪ It also explains why it is virtually certain that Britain's main trunk lines will rely on optical fibre.
▪ One projected use is for optical recognition experiments.
▪ Polished surfaces give the best optical resolution, and the double polished thin sections described in Chapter 4 are ideal.
▪ This, thought Robert, was something of an optical achievement on her part.
The Collaborative International Dictionary
Optical

Optic \Op"tic\ ([o^]p"t[i^]k), Optical \Op"tic*al\ ([o^]p"t[i^]*kal), a. [F. optique, Gr. 'optiko`s; akin to 'o`psis sight, 'o`pwpa I have seen, 'o`psomai I shall see, and to 'o`sse the two eyes, 'o`ps face, L. oculus eye. See Ocular, Eye, and cf. Canopy, Ophthalmia.]

  1. Of, pertaining to, or using vision or sight; as, optical illusions. [WordNet sense 2]

    Syn: ocular, optic, visual.

    The moon, whose orb Through optic glass the Tuscan artist views.
    --Milton.

  2. Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina; the optic (or optical) axis of the eye. See Illust. of Brain, and Eye. [WordNet sense 3]

  3. Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment. Optic angle (Opt.), the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called binocular parallax. Optic axis. (Opt.)

    1. A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen.

    2. The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line, a biaxial crystal has two.

      Optical circle (Opt.), a graduated circle used for the measurement of angles in optical experiments.

      Optical square, a surveyor's instrument with reflectors for laying off right angles.

Douglas Harper's Etymology Dictionary
optical

1560s, from optic + -al (1). Of abstract art, from 1964. Related: Optically.

Wiktionary
optical

a. 1 Of, or relating to sight; visual 2 Designed to assist or enhance sight 3 Of, or relating to optics 4 Of, or relating to visible light 5 Incorporating light-sensitive devices

WordNet
optical
  1. adj. relating to or using sight; "ocular inspection"; "an optical illusion"; "visual powers"; "visual navigation" [syn: ocular, optic, visual]

  2. of or relating to or involving light or optics; "optical supplies"

  3. of or relating to or resembling the eye; "ocular muscles"; "an ocular organ"; "ocular diseases"; "the optic (or optical) axis of the eye"; "an ocular spot is a pigmented organ or part believed to be sensitive to light" [syn: ocular, optic, opthalmic]

Wikipedia

Usage examples of "optical".

Lateral and graviton sensor array readouts, accelerometers, optical gyros, inertia!

Optical center-the site on an advertisement that is usually about two-thirds from the top.

She matched the antique ambience of the place almost to a T, the only anachronistic feature being the optical fiber running from the desk to her datajack.

It seemed to me to be such an ordinary discovery, until I learned that some of the granules were identified by optical crystallography to be travertine aragonite that had a spectral signature matching limestone samples taken from ancient Jerusalem tombs.

There was a moment of disorientation as she interpreted the picture being fed along the optical fibre plugged into her coccyx ganglion splice.

Pearl Street flat, Cozier Maitlin seemed less interested in the details of the missing optical disc than he was in providing Alan Gregory his unique perspective on homicide defense.

Matching of Hues -- Purity and Luminosity of Colours -- Matching Bright Hues -- Aid of Tinted Films -- Matching Difficulties Arising from Contrast -- Examination of Colours by Reflected and Transmitted Lights -- Effect of Lustre and Transparency of Fibres in Colour Matching -- Matching of Colours on Velvet Pile -- Optical Properties of Dye-stuffs, Dichroism, Fluorescence -- Use of Tinted Mediums -- Orange Film -- Defects of the Eye -- Yellowing of the Lens -- Colour Blindness, etc.

Being digammated, it would produce no line in the Martian spectrum, would have no corona or optical distortion effect, and could in no way be detected from Earth.

Behemoth-sized shadows moved, nightmarish ellipsoid hulls with flat heads, blazing optical sensors, and multiple murderous arms.

Le Petit Matelot,--the first of those shops which have since been established in Paris with more or less of painted signs, floating banners, show-cases filled with swinging shawls, cravats arranged like houses of cards, and a thousand other commercial seductions, such as fixed prices, fillets of suspended objects, placards, illusions and optical effects carried to such a degree of perfection that a shop-front has now become a commercial poem.

So we took the processors and RAMs out of some old Pentiums, rigged up some optical disks with movement repertoires on them, and stuck her all over with myoelectric connections.

Its guidance systems were purely passive, relying upon an optical lock on its designated target, and the control systems for its primitive, low-powered, but effective thrusters used old-fashioned mechanical linkages.

His angry eyes swept down the line-up of prisoners, clashed with the steady blue eyes of Roger Pawling, dealt an optical blow to old Dan Murphy, and came to rest, fairly sizzling upon the bronzed, half-smiling countenance of Gillian.

And the only difference between the two drugs as far as detection goes is that, when viewed through an optical rotatory device called a polarimeter, dextromethorphan rotates light to the right, and levomethorphan rotates light to the left.

In chemical composition and in optical and other physical characters it is thus much nearer to the anorthite end of the series than to albite.