Dictionary![]() ![]() id•i•o•syn•cra•syPronunciation: (id"ē-u-sing'kru-sē, -sin'-), [key] —n., —pl. -sies. 1. a characteristic, habit, mannerism, or the like, that is peculiar to an individual. 2. the physical constitution peculiar to an individual. 3. a peculiarity of the physical or the mental constitution, esp. susceptibility toward drugs, food, etc. Cf. allergy (def. 1). Also,idiocrasy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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