noun, plural al·ler·gies. 1. an abnormal reaction of the body to a previously encountered allergen introduced by inhalation, ingestion, injection, or skin contact, often ...

al·ler·gy (l r-j) n. pl. al·ler·gies. 1. An abnormally high sensitivity to certain substances, such as pollens, foods, or microorganisms. Common indications of allergy may ...

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An allergy is a sensitivity to a specific substance which causes a negative bodily reaction, such as sneezing, wheezing, itching or difficulty breathing.

Define allergy. What is allergy? allergy meaning and more by Macmillan Dictionary

Define allergy in American English. What is allergy? allergy meaning and more by Macmillan Dictionary

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Find dictionary definitions, audio pronunciations, and spellings for allergy in the free online American Heritage Dictionary on Yahoo! Education

allergy /al·ler·gy/ (al´er-je) a hypersensitive state acquired through exposure to a particular allergen, reexposure bringing to light an altered capacity to react.

An allergy is a hypersensitivity disorder of the immune system Allergic reactions occur when a person's immune system reacts to normally harmless substances in the environment.

allergy noun - definition, audio pronunciation, synonyms and more for allergy noun: a condition that makes a person become ill or develop skin or breathing problems because ...

Allergy : (noun) 1: hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity [syn: allergic reaction] Based on WordNet 2.0

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Definition and other additional information on Allergy from Biology-Online.org dictionary.

allergy /al·ler·gy/ (al´er-je) a hypersensitive state acquired through exposure to a particular allergen, reexposure bringing to light an altered capacity to react.

noun pl. allergies. a hypersensitivity to a specific substance (such as a food, pollen, dust, etc.) or condition (as heat or cold) which in similar amounts or degrees is ...