from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A substance that when introduced into the body stimulates the production of an antibody. Antigens include toxins, bacteria, foreign blood cells, and the cells of transplanted organs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A substance that induces an immune response, usually foreign.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
From French antigène, from anti- + gène. (Wiktionary)