An allergic reaction that becomes apparent in a sensitized person only minutes after contact

Wiktionary Word definitions in Wiktionary
n. 1 (context medicine English) A hereditary disorder marked by the tendency to develop localized immediate hypersensitivity reactions to allergens such as pollen, food etc and is manifested by hay fever, asthma, or similar allergic conditions; generally ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
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- , privative prefix ...

Wikipedia Word definitions in Wikipedia
Atopy ( Greek ἀτοπία - placelessness, out of place, special, unusual, extraordinary) or atopic syndrome is a predisposition toward developing certain allergic hypersensitivity reactions. Atopy may have a hereditary component, although contact with the allergen ...

WordNet Word definitions in WordNet
n. an allergic reaction that becomes apparent in a sensitized person only minutes after contact [syn: immediate allergy , atopic allergy , type I allergic reaction ]