a. and sb. [ad. L. adulterant-em pr. pple. of adulterā-re: see ADULTER v. Prop. an adj., but usually subst.]

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  A.  sb. That which adulterates, or is employed to adulterate anything. (J. says ‘The person or thing which adulterates’; but it does not seem ever to have been used in Eng. of a person.)

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1755.  Johnson, n.q.

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1861.  Jrnl. Soc. Arts, IX. 488/2. Mr. John Horsley of Cheltenham has also found copper as an adulterant in the bread and flour of that place.

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1881.  A. Griffiths, Sc. Gossip, No. 203. 248. By a careful microscopical examination these adulterants can be easily found out.

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  B.  adj. Adulterating.

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1881.  Philad. Rec., No. 3470. 2. Adulterant agents and processes rest on no better principle than short measures and false weights.

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