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Allergies, also known as allergic diseases, are a number of conditions caused by ...... phenomenon "allergy" from the Ancient Greek words ἄλλος allos meaning ...

Allergy | Definition of Allergy by Merriam-Webster


a medical condition that causes someone to become sick after eating, touching, or breathing something that is harmless to most people. Source: ...

allergy Definition in the Cambridge English Dictionary


allergy definition, meaning, what is allergy: a condition that makes a person become sick or develop skin or breathing problems because…. Learn more.

Allergy - definition of allergy by The Free Dictionary


Define allergy. allergy synonyms, allergy pronunciation, allergy translation, English dictionary definition of allergy. n. pl. al·ler·gies 1. An abnormally high ...

Allergy Defined | AAAAI


An allergy is a chronic condition involving an abnormal reaction to an ordinarily harmless substance called an allergen. If you have an allergy, your immune ...

What is allergy? - Australasian Society of Clinical Immunology and ...


Allergy - a definition. Allergy occurs when a person's immune system reacts to substances in the environment that are harmless for most people.

allergy - Dictionary Definition : Vocabulary.com


An allergy is a physical reaction to some specific food or substance. If you have an allergy to cats, they'll make you itchy and swollen no matter how much you ...

Allergies - Mayo Clinic


Allergies — Comprehensive overview covers allergy symptoms, allergy testing, treatment of an allergic reaction. ... Definition. By Mayo Clinic Staff ...

allergy - definition of allergy in English from the Oxford dictionary


Meaning, pronunciation and example sentences, English to English reference content. ... 1.1 informal A strong dislike: their allergy to free enterprise.

Allergy and Asthma Definitions | Glossary & Terms | ACAAI


Allergies are inappropriate or exaggerated reactions of the immune system to substances that, in the majority of people, cause no symptoms. Symptoms of the ...

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Allergy | Define Allergy at Dictionary.com


Allergy definition, an abnormal reaction of the body to a previously encountered allergen introduced by inhalation, ingestion, injection, or skin contact, often ...

Allergy | definition of allergy by Medical dictionary


Hypersensitivity caused by exposure to a particular antigen (allergen) resulting in a marked increase in reactivity to that antigen on subsequent exposure, ...

Definition of Allergy - MedicineNet


Allergy: A misguided reaction to foreign substances by the immune system, the body system of defense against foreign invaders, particularly pathogens (the ...