Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

allergen

noun [C]
 
 
/ˈæl.ə.dʒən/ US  /-ɚ-/ specialized

Definition

a substance that can cause an allergy (= condition of the body reacting badly to something) but is not harmful to most peoplePoisoning and allergy
(Definition of allergen noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Word of the Day

ride (out) the storm

to manage not to be destroyed, harmed or permanently affected by the difficult situation you...

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More