Pronunciation: (an'ti-jun, -jen"), [key]
1. Immunol.any substance that can stimulate the production of antibodies and combine specifically with them.
2. Pharm.any commercial substance that, when injected or absorbed into animal tissues, stimulates the production of antibodies.
3. antigens of a particular type collectively.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.