English

karyofission

From karyo- + fission.

Ancient Greek κάρυον ‘kernel’

Proto-Indo-European *bʰeyd- ‘to split’

…

Proto-Italic *findō ‘to split, cleave’

Latin findō ‘split, divide’

Latin fissiō ‘the act of breaking up’

Latin fissiōnem

Today it means

noun The fission of the nuclei of cells

Language periods are conventional ranges, not dates for this word.

Etymograph / karyofission