Webster's English Dictionary

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allergy

al.ler.gy \'al-*r-je-\ n [G allergie, fr. all- + Gk ergon work - more at 
   WORK] 1: altered bodily reactivity (as to antigens)  2: exaggerated or 
   pathological reaction (as by sneezing, respiratory embarr assment, itching, 
   or skin rashes) to substances, situations, or physical states that are 
   without comparable effect on the average individual 3: a feeling of 
   antipathy or repugnance