(n) any substance that lessens the purity or effectiveness of a substance, Syn. adulterator, Example:it is necessary to remove the adulterants before use
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n. [ L. adulterans, p. pr. of adulterare. ] That which is used to adulterate anything. -- a. Adulterating; as, adulterant agents and processes. [ 1913 Webster ]