adulterant
adul·te·rant
adjective
1.
making impure or corrupt by adding extraneous materials
- “the adulterating effect of extraneous materials”
noun
1.
any substance that adulterates (lessens the purity or effectiveness of a substance)
- “it is necessary to remove the adulterants before use”
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.