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en.wikipedia.org/wiki/Allergy

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

www.merriam-webster.com/dictionary/allergy

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

www.dictionary.com/browse/allergy

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

www.medicinenet.com/script/main/art.asp?articlekey=2201

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

www.aaaai.org/conditions-and-treatments/conditions-dictionary/allergy

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

en.oxforddictionaries.com/definition/allergy

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.

medical-dictionary.thefreedictionary.com/allergy

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

dictionary.cambridge.org/us/dictionary/english/allergy

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

www.mayoclinic.org/diseases-conditions/allergies/home/ovc-20270181

Nov 22, 2016 ... Allergies occur when your immune system reacts to a foreign substance — such as pollen, bee venom or pet dander — or to a food that doesn't ...