allergy

American  

[al-er-jee] / ˈæl ər dʒi /

noun

• allergies
  plural

1. an abnormal reaction of the body to a previously encountered allergen introduced by inhalation, ingestion, injection, or skin contact, often manifested by itchy eyes, runny nose, wheezing, skin rash, or diarrhea.

2. hypersensitivity to the reintroduction of an allergen.

3. Informal. a strong dislike or aversion, as toward a person or activity.

   He has an allergy to hard work.

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allergy British  

/ ˈælədʒɪ /

noun

1. a hypersensitivity to a substance that causes the body to react to any contact with that substance. Hay fever is an allergic reaction to pollen

2. informal aversion

   he has an allergy to studying

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allergy Scientific  

/ ăl′ər-jē /

1. An abnormally high immunologic sensitivity to certain stimuli such as drugs, foods, environmental irritants, microorganisms, or physical conditions, such as temperature extremes. These stimuli act as antigens, provoking an immunological response involving the release of inflammatory substances, such as histamine, in the body. Allergies may be innate or acquired in genetically predisposed individuals. Common symptoms include sneezing, itching, and skin rashes, though in some individuals symptoms can be severe.

2. See also anaphylactic shock

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allergy Cultural  

1. A highly sensitive reaction of the body to certain substances, such as pollen, that are present in amounts that do not affect most people. Common indications of allergy include sneezing, skin rashes, itching, and runny nose.

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Other Word Forms

Noun Inflected Forms

• allergies
  plural

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Etymology

Origin of allergy

1910–15; < Greek áll ( os ) other + -ergy < Greek -ergia, equivalent to érg ( on ) activity + -ia -y ³

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Explanation

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 love to pet them. If you have an allergy, it can range from mild — itchy eyes in the springtime — to serious — being unable to breathe after eating a peanut. People have allergies to all kinds of things, including milk, chocolate, corn, dust, mold, and just about any kind of animal you can think of. Allergy was originally Allergie, a German word invented by a doctor who combined the Greek roots allos, "other, different, or strange," and ergon, "activity."

Example Sentences

See Examples For:

allergy allergies

The Education Minister, Paul Givan, has committed to a consultation on a similar change in Northern Ireland to introduce stronger allergy guidance for Northern Ireland schools.

From BBC ● Oct. 24, 2026

The family of a 12-year-old girl who died after drinking a milkshake made in an unwashed blender at a cafe have called for a dedicated rating that scores food businesses on their allergy management.

From BBC ● Oct. 8, 2026

Accommodating a child’s food allergy is one thing.

From The Wall Street Journal ● Sep. 16, 2026

These sublethal effects can be compared to the way an over-the-counter antihistamine may relieve allergy symptoms while also causing drowsiness.

From Science Daily ● Aug. 6, 2026

“There’s a possibility Sir Fig Newton has an allergy to one of these common ingredients,” Dr. Spires said.

From "Sir Fig Newton and the Science of Persistence" by Sonja Thomas

Niamh Kennedy has three children who have food allergies and she is the chair of Food Allergy NI, the voluntary group who organised the training.

From BBC ● Oct. 24, 2026

"This would mean that people with allergies could make more informed choices about where they eat."

From BBC ● Oct. 8, 2026

To pay my respect, I ate not only for myself but my whole family, whose allergies and aversions led them to abstain.

From The Wall Street Journal ● Sep. 23, 2026

Meanwhile, conditions like allergies often don’t show up until a pet is 2 or 3 years old, Quammen said.

From MarketWatch ● Sep. 15, 2026

All parents will provide a list of rules, allergies, and emergency contact information.

From "South of Somewhere" by Kalena Miller

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Related Words

• hay fever

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