denature
(verb)
verb
1. add nonfissionable material to (fissionable material) so as to make unsuitable for use in an atomic bomb
Definition categories: change, alter, modify
2. modify (as a native protein) especially by heat, acid, alkali, or ultraviolet radiation so that all of the original properties are removed or diminished
Definition categories: change, alter, modify
3. make (alcohol) unfit for drinking without impairing usefulness for other purposes