—n., adj.kun-tam'u-nit, -nāt"), [key]
—v., -nat•ed, -nat•ing,
1. to make impure or unsuitable by contact or mixture with something unclean, bad, etc.: to contaminate a lake with sewage.
2. to render harmful or unusable by adding radioactive material to: to contaminate a laboratory.
something that contaminates or carries contamination; contaminant.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.