adulterator

Noun
  1. Any substance that lessens the purity or effectiveness of a substance (synset 114641117)
    "it is necessary to remove the adulterants before use"
    is a type of: substance - a particular kind or species of matter with uniform properties
    same as: adulterant
  2. A changer who lessens the purity or effectiveness of a substance (synset 109792029)
    is a type of: changer, modifier - a person who changes something

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