agglutinogen

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An antigen that stimulates the production of a particular agglutinin, such as an antibody.

from The Century Dictionary.

• noun A substance present in bacteria, immunization with which gives rise to the production of agglutinins.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biochemistry Any antigen that stimulates the production of an agglutinin

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any substance that acts as an antigen to cause agglutinin production