plural allergies
Definition of allergy
1
: altered bodily reactivity (such as hypersensitivity) to an antigen in response to a first exposure
a bee venom allergy so severe that a second sting may be fatal
2
: exaggerated or pathological immunological reaction (as by sneezing, difficult breathing, 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
4
: a feeling of antipathy or aversion
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Merriam-Webster unabridged
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Time Traveler for allergy
The first known use of allergy was in 1908
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