Learner's Dictionary mobile search

Learner's Dictionary

allergen

1 ENTRIES FOUND:

Save

allergen /ˈælɚʤən/ noun

plural allergens

allergen

/ˈælɚʤən/

noun

plural allergens

Learner's definition of ALLERGEN

[count] medical

: a substance that causes an allergy

— allergenic

/ˌælɚˈʤɛnɪk/ adjective [more allergenic; most allergenic]

ASK THE EDITOR

See the answer »

LEARNER'S QUIZZES

Vocabulary Quiz

Test your word power

Take the Quiz »

Name That Thing

Take our visual quiz

Test Your Knowledge »

LEARNER'S WORD OF THE DAY

: to run away from danger

Learn More »

The Merriam-Webster
Unabridged Dictionary

Online access to a
legendary resource
Log In or Sign Up »

Our Dictionary,
On Your Devices

Merriam-Webster,
With Voice Search
Get the Free Apps! »

Merriam-Webster's
Visual Dictionaries

The new edition of the
remarkable reference
features 8,000
illustrations.
Learn More »

Join Us

Learner's Dictionary
on Twitter »

Learner's Dictionary
on Facebook »

Bookstore: Digital and Print

Merriam-Webster references for Mobile, Kindle, print, and more. See all »

Other Merriam-Webster Dictionaries

Webster's Unabridged Dictionary » Nglish - Spanish-English Translation » Britannica English - Arabic Translation » Visual Dictionary »

Browse the Learner's Dictionary