/ ˈælədʒi; NAmE ˈælərdʒi/ noun
( pl. -ies ) allergy (to sth) a medical condition that causes you to react badly or feel ill / sick when you eat or touch a particular substance :
I have an allergy to animal hair.
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WORD ORIGIN
early 20th cent.: from German Allergie , from Greek allos other, on the pattern of Energie energy.