allergy

play
noun al·ler·gy \ˈa-lər-jē\

Definition of allergy

plural

allergies

  1. 1 :  altered bodily reactivity (such as hypersensitivity) to an antigen in response to a first exposure a bee venom allergy so severe that a second sting may be fatal

  2. 2 :  exaggerated or pathological immunological reaction (as by sneezing, difficult breathing, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual

  3. 3 :  medical practice concerned with allergies

  4. 4 :  a feeling of antipathy or aversion

Examples of allergy in a Sentence

  1. Many people have some form of allergy.

  2. independent-minded people who seem to have an allergy to any control from the government

Origin and Etymology of allergy

German Allergie, from all- + Greek ergon work — more at work


First Known Use: 1908


ALLERGY Defined for English Language Learners

allergy

play
noun al·ler·gy \ˈa-lər-jē\

Definition of allergy for English Language Learners

  • : a medical condition that causes someone to become sick after eating, touching, or breathing something that is harmless to most people


ALLERGY Defined for Kids

allergy

play
noun al·ler·gy \ˈa-lər-jē\

Definition of allergy for Students

plural

allergies

  1. :  a condition in which a person is made sick by something that is harmless to most people


Medical Dictionary

allergy

play
noun al·ler·gy \ˈal-ər-jē\

Medical Definition of allergy

plural

allergies

  1. 1:  altered bodily reactivity (as hypersensitivity) to an antigen in response to a first exposure his bee-venom allergy may render a second sting fatal

  2. 2:  exaggerated or pathological reaction (as by sneezing, respiratory embarrassment, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual

  3. 3:  medical practice concerned with allergies



Seen and Heard

What made you want to look up allergy? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to give up a position of power

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • winning-words-from-the-national-spelling-bee-logo
  • Which is the correct spelling of the winning word from 1988?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!