| 1. | to deprive (something) of its natural character, properties, etc. |
| 2. | to render (any of various alcohols) unfit for drinking by adding an unwholesome substance that does not alter usefulness for other purposes. |
| 3. | Biochemistry. to treat (a protein or the like) by chemical or physical means so as to alter its original state. |
| 4. | to make (fissionable material) unsuitable for use in an atomic weapon by mixing it with unfissionable material. |
denature de·na·ture (dē-nā'chər)
v. de·na·tured, de·na·tur·ing, de·na·tures
To change the nature or natural qualities of.
To render unfit to eat or drink without destroying usefulness in other applications, especially adding methyl alcohol to ethyl alcohol.
To alter the chemical structure of a protein, as with heat, alkali, or acid, so that some of its original properties, especially its biological activity, are diminished or eliminated.