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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: a medical condition that causes someone to become sick after eating, touching, or breathing something that is … — 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.


a damaging immune response by the body to a substance, es... Meaning, pronunciation, example sentences, and more from Oxford Dictionaries.


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.


A condition in which exposure to a substance, such as pollen, latex, animal dander, or a particular food or drug, causes an overreaction by the immune system ...


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 ...