n, pl  -gies  1  :  altered bodily reactivity (as hypersensitivity) to an antigen in response to a first exposure <his bee-venom 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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