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[at-uh-pee] /ˈæt ə pi/
an allergy, involving an inherited immunoglobulin of the IgE type, that predisposes a person to certain allergic responses, as atopic dermatitis.
1920-25; < Greek atopía extraordinariness, equivalent to átop(os) out of place, unusual (see a-6, topo-) + -ia -y3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for atopy


(immunol) a hereditary tendency to be hypersensitive to certain allergens
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for atopy
1923 (as is adj. form atopic), coined by Edward D. Perry, professor of Greek at Columbia University, at the request of medical men, from Gk. atopia "unusualness," from a-, privative prefix, + topos "place."
Online Etymology Dictionary, © 2010 Douglas Harper
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atopy in Medicine

atopy at·o·py (āt'ə-pē)
A hereditary disorder marked by the tendency to develop immediate allergic reactions to substances such as pollen, food, dander, and insect venoms and manifested by hay fever, asthma, or similar allergic conditions. Also called atopic allergy.

a·top'ic (ā-tŏp'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for atopy

type of hypersensitivity characterized by an immediate physiological reaction, with movement of fluid from the blood vessels into the tissues, upon exposure to an allergen. Atopy occurs mainly in persons with a familial tendency to allergic diseases; reaginic antibodies are found in the skin and serum of atopic persons. Atopy may be contrasted with the condition called delayed hypersensitivity, in which allergic symptoms take hours or days to develop. See also allergy.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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