"adulterant" in the noun sense
1. adulterant, adulterator
any substance that lessens the purity or effectiveness of a substance
"it is necessary to remove the adulterants before use"
"adulterant" in the adjective sense
1. adulterating, adulterant
making impure or corrupt by adding extraneous materials
"the adulterating effect of extraneous materials"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License