to debase or make impure by adding inferior materials or elements; use cheaper, inferior, or less desirable goods in the production of (any professedly genuine article): to adulterate food.
Origin: 1580–90; < Latin adulterātus mixed, adulterated (past participle of adulterāre), equivalent to ad-ad- + -ulter (perhaps combining form of alter other; see alter) + -ātus-ate1