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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: ...

Allergic | Define Allergic at Dictionary.com


Allergic definition, of or relating to allergy: an allergic reaction to wool. See more.

Allergen | Define Allergen at Dictionary.com


Allergen definition, any substance, often a protein, that induces an allergy: common allergens include pollen, grasses, dust, and some medications. See more.

Allergy - definition of allergy by The Free Dictionary


An abnormally high sensitivity to certain substances, such as pollens, foods, or microorganisms. Common indications of allergy may include sneezing, itching, ...

Allergies - Mayo Clinic


Allergies — Comprehensive overview covers allergy symptoms, allergy testing, ... Definition. By Mayo Clinic Staff. Allergies occur when your immune system ...

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 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 ...

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 ...

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.

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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 - Allergy Center: Medical Information on Allergies


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

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.