Etymology
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atopy (n.)

"type of abnormal hypersensitiveness," 1923, coined by Edward D. Perry, professor of Greek at Columbia University, at the request of medical men, from Greek atopia "unusualness, strangeness, a being out of the way," from atopos "out of place, strange, odd, eccentric," from a- "not, without" (see a- (3)) + topos "place" (see topos).

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Definitions of atopy

atopy (n.)
an allergic reaction that becomes apparent in a sensitized person only minutes after contact;
Synonyms: immediate allergy / atopic allergy / type I allergic reaction
From wordnet.princeton.edu