adulterating

transitive verb | \ ə-ˈdəl-tə-ˌrāt \ | adul·ter·ate

1. : to corrupt, debase, or make impure by the addition of a foreign or inferior substance or element; especially : to prepare for sale by omitting a valuable ingredient or by replacing more valuable ingredients with less valuable or inert and usually harmful ingredients or with ingredients different from those claimed : to prepare for sale by omitting a valuable ingredient or by replacing more valuable ingredients with less valuable or inert and usually harmful ingredients or with ingredients different from those claimed

   Note: Under the federal Food, Drug, and Cosmetic Act, a device such as a piece of medical equipment that is defective in some way is considered adulterated.