Definition of allergy noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈælədʒi//
; NAmE NAmE//ˈælərdʒi//
(pl. allergies) Healthy eating habits, Poor health
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allergy (to something) 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. Hay fever is caused by an allergy to pollen. See related entries: Healthy eating habits, Poor health Word Originearly 20th cent.: from German Allergie, from Greek allos ‘other’, on the pattern of Energie ‘energy’.Extra examples Hair and feathers can cause allergies. He developed an allergy to pollen. In severe cases your doctor may recommend allergy shots. You may wish to consult a food allergy specialist for help in planning your diet.
See the Oxford Advanced American Dictionary entry: allergy