denature /dē-nāˈchər/, also denaturize or denaturise /dē-nāˈchər-īz/

1. To change the nature or properties of (eg a protein by heat or other treatment)
2. To render (alcohol, etc) unfit for human consumption
3. To add (non-radioactive material) to radioactive material, in order to prevent its being used in an atomic bomb (nuclear industry)

denāˈturant noun

A substance used to denature another

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