WordReference Random House Learner's Dictionary of American English © 2026
an•ti•gen /ˈæntɪdʒən, -ˌdʒɛn/USA pronunciation
n. [countable]
an•ti•gen•i•cal•ly, adv. See -gen-.
WordReference Random House Unabridged Dictionary of American English © 2026- Immunologya protein that can cause the body to react by producing an antibody that fights infection or disease.
an•ti•gen•i•cal•ly, adv. See -gen-.
an•ti•gen
(an′ti jən, -jen′),USA pronunciation n.
an•ti•gen•ic
(an′ti jen′ik),USA pronunciation adj.
an′ti•gen′i•cal•ly, adv.
an•ti•ge•nic•i•ty
(an′ti jə nis′i tē),USA pronunciation n.
- Immunologyany substance that can stimulate the production of antibodies and combine specifically with them.
- Drugs[Pharm.]any commercial substance that, when injected or absorbed into animal tissues, stimulates the production of antibodies.
- Immunologyantigens of a particular type collectively.
- 1905–10; anti(body) + -gen
'antigenic' also found in these entries (note: many are not synonyms or translations):