Adulterant

noun

Definitions

Adjective
  1. 1
    making impure or corrupt by adding extraneous materials wordnet
Noun
  1. 1
    That which adulterates, or reduces the purity of something.

    "With regard to the presence of opium in ale, it appears to form a very deleterious adulterant;"

  2. 2
    any substance that lessens the purity or effectiveness of a substance wordnet

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