allergen

from WordNet (r) 3.0 (2006)

allergen
    n 1: any substance that can cause an allergy

from Moby Thesaurus II by Grady Ward, 1.0

25 Moby Thesaurus words for "allergen":
      Rh factor, agglutinin, allergic disorder, allergy, anaphylactin,
      antiantibody, antibody, antigen, antiserum, antitoxic serum,
      antitoxin, antivenin, asthma, conjunctivitis, cosmetic dermatitis,
      eczema, hay fever, hives, incomplete antibody, interferon,
      pollinosis, precipitin, rose cold, serum, urticaria