WordReference Random House Unabridged Dictionary of American English © 2025
at•o•py  (atə pē),USA pronunciation n. 
  1. Pathology, Immunologyan allergy, involving an inherited immunoglobulin of the IgE type, that predisposes a person to certain allergic responses, as atopic dermatitis.
  • Greek atopía extraordinariness, equivalent. to átop(os) out of place, unusual (see a-6, topo-) + -ia -y3
  • 1920–25

'atopy' also found in these entries (note: many are not synonyms or translations):

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