Adulterate

1. a. Debased by the admixture of a foreign substance; adulterated; spurious.
2. v. t. To defile by adultery.
3. v. t. To corrupt, debase, or make impure by an admixture of a foreign or a baser substance; as, to adulterate food, drink, drugs, coin, etc.
4. v. i. To commit adultery.
5. a. Tainted with adultery.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.