Medical Dictionary

allergy

noun al·ler·gy \ˈal-ər-jē\
plural al·ler·gies

Medical Definition of ALLERGY

1
:  altered bodily reactivity (as hypersensitivity) to an antigen in response to a first exposure <his bee-venom allergy may render a second sting fatal>
2
:  exaggerated or pathological reaction (as by sneezing, respiratory embarrassment, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual
3
:  medical practice concerned with allergies

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