1. Not pure; not clean; dirty; foul; filthy; containing something which is unclean or unwholesome; mixed or impregnated extraneous substances; adulterated; as, impure water or air; impure drugs, food, etc.
Origin: L. Impurus; pref. Im- not + purus pure: cf. F. Impur. See Pure.
(01 Mar 1998)
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