: to corrupt, debase, or make impure by the addition of a foreign or inferior substance or element
: 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.
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.