What does "allergen" mean?

A substance which causes an allergic reaction.

How do you pronounce "allergen"?

Pronounced //ˈælə(ɹ)ˌd͡ʒɛn//.

Common synonyms include: agglutinin, allergenic antigen, allergic disorder, allergic potential, allergic trigger, allergy.

/ˈælə(ɹ)ˌd͡ʒɛn/ noun

noun ·Rare ·Advanced level

Noun

1
A substance which causes an allergic reaction.
"Pollen, dust, and spores are common allergens."
2
any substance that can cause an allergy wordnet

"A lab at the University of California, Los Angeles is trying to solve that problem by developing a handheld allergen detector for consumers."

Syncopated compound of allergy + -gen, coined on the model of pharmaceutical words such as pathogen and antigen.