Definition of revertent:
(adj) :
Having reverted to a previous (more basic or more natural) state.
(n) :
(by extension) Any remedy that restores something to its desired natural state.
(n) :
A mutation that reverts or undoes the effects of another mutation.
(n) :
(medicine, obsolete) A remedy which restores the natural order of the inverted irritative motions in the animal system