reverter

Noun

 * 1) One who, or that which, reverts.
 * 2)  The reversion of ownership of an estate in land to the original grantor pursuant to the occurrence of a condition set forth in the original grant.

Derived terms

 * possibility of reverter

Verb

 * 1) to revert (especially on a wiki)

Verb

 * 1) to revert to turn to the contrary