WordWeb Online

1. Making impure or corrupt by adding extraneous materials
   "the adulterating effect of extraneous materials";
   - adulterant

1. Corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones
   "adulterate liquor";
   - load, stretch, dilute, debase

See also: extraneous, foreign

Type of: corrupt, spoil

Encyclopedia: Adulterate