Noun allergy has 1 sense
  1. allergy, allergic reaction - hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity
    --1 is a kind of hypersensitivity reaction
    --1 has particulars:
     food allergy; immediate allergy, atopy, atopic allergy, type I allergic reaction; serum sickness, serum disease; delayed allergy, type IV allergic reaction