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Longman Dictionary of Contemporary English
pathological
adjective
COLLOCATIONS FROM OTHER ENTRIES
a congenital/pathological/compulsive liarformal (= who tells lies because it is part of their personality to do so)
▪ He called her a congenital liar who would say anything to stay out of trouble.
COLLOCATIONS FROM CORPUS
■ NOUN
change
▪ Several divergent but characteristic pathological changes have been previously shown within the pouch mucosa.
▪ The pathological changes of mucosal prolapse deserve particular mention.
EXAMPLES FROM OTHER ENTRIES
pathological gambling
▪ a pathological fear of being alone
EXAMPLES FROM CORPUS
▪ I knew perfectly well that I had anorexia, but I did not see it as something pathological.
▪ Several divergent but characteristic pathological changes have been previously shown within the pouch mucosa.
▪ Some say there is an on-line addiction that resembles pathological gambling more than it does alcoholism or drug abuse.
▪ The pathological changes of mucosal prolapse deserve particular mention.
▪ The crude and splenetic expression and presentation of such views suggested irrational pathological prejudice rather than a coherent ideology.
▪ The types of pathological processes known to cause epilepsy are numerous.
▪ What is pathological behaviour in a man is required of a woman.
The Collaborative International Dictionary
Pathological

Pathologic \Path`o*log"ic\, Pathological \Path`o*log"ic*al\, a.

  1. Of or pertaining to pathology.

  2. (Med.) caused by or due to disease; abnormal; morbid; as, pathological tissue; a pathological condition. [Webster 1913 Suppl.] -- Path`o*log"ic*al*ly, adv.

Douglas Harper's Etymology Dictionary
pathological

1680s, "pertaining to disease," formed in English from pathologic + -al (1). Sense of "worthy to be a subject of pathology, morbid, excessive" (as in pathological liar) is attested from 1845. Related: Pathologically.

Wiktionary
pathological

a. 1 (context medicine English) Pertaining to pathology. 2 (context medicine English) Relating to, amounting to, causing, or caused by a physical or mental disorder. 3 (context mathematics English) Having properties which are counterintuitive or difficult to handle. 4 (context computer science English) Having properties that cause unusually bad behaviour, especially regarding correctness or performance.

WordNet
pathological
  1. adj. of or relating to the practice of pathology; "pathological laboratory" [syn: pathologic]

  2. caused by or evidencing a mentally disturbed condition; "a pathological liar"; "a pathological urge to succeed"

  3. caused by or altered by or manifesting disease or pathology; "diseased tonsils"; "a morbid growth"; "pathologic tissue"; "pathological bodily processes" [syn: diseased, morbid, pathologic]

Wikipedia
Pathological (mathematics)

In mathematics, a pathological phenomenon is one whose properties are considered atypically bad or counterintuitive; the opposite is well-behaved. A notable case is the Alexander horned sphere, a counterexample showing that topologically embedding the sphere S in R may fail to "separate the space cleanly", unless an extra condition of tameness is used to suppress possible wild behaviour. See Jordan–Schönflies theorem.

Usage examples of "pathological".

Alliance that you have discovered an un-researched pathological allele and want to find how it causes cell failure.

The Slavic groups are apparently slowly being assimilated, but even if they disappeared entirely, the remaining Culturally-parasitic groups would comprise a pathological condition of the utmost seriousness for America.

And since the only school of thought to which he was accustomed was essentially pathological and pathognomonic, he psyched himself up one side and down the other, growing more and more bewildered.

But suggestions that the novel exhibits a pathological structure go only part of the way: the structure reflects a pathology in Russian society that links femininity, even sacralized femininity, with degradation.

This is the coefficient for most physical and mental characters: it is the coefficient for such pathological traits as deafness and insanity, which are obviously due in most cases to inheritance rather than infection.

Or mutant pep tides present only under pathological behavioral conditions, such as the tripeptide found in .

Or mutant peptides present only under pathological behavioral conditions, such as the tripeptide found in anorexia nervosa.

The Department of Physiology of the University of Minnesota reported that the material used for the demonstration of physiological and pathological phenomena before students consisted of 88 dogs, 74 cats, and 420 other animals, making a total of 582 for the year 1914.

The other things that go along with the syndrome are hypersexuality and pathological intoxication.

Thus despite pathological fears of Catholicism among nineteenth-century American evangelical Protestants, since the 1820s a political alliance has existed on and off between the Jacksonian tradition in the South and West and sections of the Catholic Irish in the Northeast.

I am not sure I would stand and point at Orin as an example of a classic pathological liar, but you have only to watch him in certain kinds of action to see that there can be such a thing as sincerity with a motive.

An especially grotesque form of pathological lying, named after Baron von Munchausen, the world-class prevaricator.

In fact, a blind ophthalmologist is not much good to anyone, but it was up to him to inform the health authorities, to warn them of this situation which might turn into a national catastrophe, nothing more nor less, of a form of blindness hitherto unknown, with every appearance of being highly contagious, and which, to all appearances, manifested itself without the previous existence of earlier pathological symptoms of an inflammatory, infectious or degenerative nature, as he was able to verify in the blind man who had come to consult him in his surgery, or as had been confirmed in his own case, a touch of myopia, a slight astigmatism, all so mild that he had decided, in the meantime, not to use corrective lenses.

There are several quite distinct pathological conditions of the vocal and respiratory organs which have, in popular parlance, been designated as croup.

A typical egocentric pathological legacy is a van Gieson staining of a Schwann cell nuclei from a Schwannoma, and Scarpetta fails to understand why German naturalist Theodor Schwann would have wanted a tumor named after him.