Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

allergen

play
noun al·ler·gen \ˈa-lər-jən\

Simple Definition of allergen

  • medical : a substance that causes an allergy

Source: Merriam-Webster's Learner's Dictionary

Full Definition of allergen

  1. :  a substance (as pollen) that induces allergy

allergenic

play \ˌa-lər-ˈje-nik\ adjective

allergenicity

play \ˌa-lər-jə-ˈni-sə-tē\ noun

Examples of allergen in a sentence

  1. common allergens, such as pollen



Origin and Etymology of allergen

International Scientific Vocabulary allergy + -gen


First Known Use: 1910


ALLERGEN Defined for Kids

allergen

play
noun al·ler·gen \ˈa-lər-jən\

Definition of allergen for Students

  1. :  a substance that causes an allergic reaction




Medical Dictionary

allergen

play
noun al·ler·gen \ˈal-ər-jən\

Medical Definition of allergen

  1. :  a substance that induces allergy <inhaled allergens> <a suspected food allergen>




Learn More about allergen


Seen and Heard

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

WORD OF THE DAY

a jerking and twitching of the body

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

two-chairs-on-a-pier-by-the-ocean-in-summer

Which of the following words means “of or relating to summer”?

estival brumal vernal hiemal
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ