a·dul·ter·ate 
(ə-dŭltə-rāt′)
(ə-dŭltə-rāt′)tr.v. a·dul·ter·at·ed, a·dul·ter·at·ing, a·dul·ter·ates
To make impure by adding extraneous, improper, or inferior ingredients.
adj. (-tər-ĭt)
Archaic
Archaic
1. Spurious; adulterated.
2. Adulterous.
[Latin adulterāre, adulterāt-, to pollute; see al-1 in the Appendix of Indo-European roots.]
a·dul′ter·ation n.
a·dulter·a′tor n.