Answer: fission

AnswerCrossword Clue
FISSION

Splitting.

FISSION

A splitting into parts.

FISSION

Splitting of an atom nucleus.

FISSION
Process by which amoebas multiply.
FISSION
Splitting of molecules.
FISSIONAtom splitting.
FISSIONA splitting, as of atoms
FISSIONAtomic energy source
FISSIONEnergy producer
FISSIONSplitting
FISSIONGamma ray producer