Transmutation

The act of transmuting, or the state of being transmuted; as, the transmutation of metals.

The change or reduction of one figure or body into another of the same area or solidity, but of a different form, as of a triangle into a square.

The change of one species into another, which is assumed to take place in any development theory of life; transformism.

(physics) the change of one chemical element into another (as by nuclear decay or radioactive bombardment); "the transmutation of base metals into gold proved to be impossible"