Definition of fissioned:
(n) :
The process whereby one item splits to become two.
(n) :
(nuclear physics) nuclear fission: The process of splitting the nucleus of an atom into smaller particles.
(n) :
(biology) The process by which a bacterium splits to form two daughter cells.
(v) :
(intransitive) To undergo fission.
(v) :
(transitive) To cause to undergo fission.