from the GNU version of the Collaborative International Dictionary of English.
- noun any substance that produces immunity when introduced into the body.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun immunology Any substance that elicits a
immune response; an antigen
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any substance or organism that provokes an immune response (produces immunity) when introduced into the body
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