from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A localized region on the surface of an antigen that is capable of eliciting an immune response and of combining with a specific antibody to counter that response.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. That part of a biomolecule (such as a protein) that is the target of an immune response
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the site on the surface of an antigen molecule to which an antibody attaches itself
epi- + Greek topos, place, spot.(American Heritage® Dictionary of the English Language, Fourth Edition)