- To make impure by adding inferior or tainted substances.
- To reduce the purity or effectiveness of a substance by adding something else to it.
From the latin word adulterāre, meaning "to corrupt, debase, or make impure".
- The company was accused of adulterating their products with cheap fillers.
- The food inspector found that the milk had been adulterated with water.
- The wine had been adulterated with cheaper grape juice.
- The company adulterated the gasoline with kerosene.
- The drugs had been adulterated with unknown substances.