Use it as a verb. It means to mix with other substances.
Don't you dare adulterate my ketchup with mustard. And keep your jelly out of my peanut butter too. I prefer unadulterated condiments.
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Hospitals take strict precautions to assure that nothing will adulterate the blood supply.
Unscrupulous growers may adulterate their Orange Juice with pulpwash, a cheap byproduct.
The chef was caught adulterating the ingredients in the recipe by adding cheap substitutes, resulting in a lower quality dish.