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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 ...


Define allergy: altered bodily reactivity (such as hypersensitivity) to an antigen in response to a first exposure — allergy in a sentence.


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


Read medical definition of Allergy. ... Allergy: A misguided reaction to foreign substances by the immune system, the body system of defense against foreign ...


AAAAI experts explain an allergy is a reaction to an allergen.


Definition of allergy - a damaging immune response by the body to a substance, especially a particular food, pollen, fur, or dust, to which it has become.


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


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