Where does “centronuclear” come from?

centronuclear (English) comes from English centro-, from English centre, from Middle English center, from Middle French centre, from Latin centrum, from Ancient Greek κέντρον, from Proto-Hellenic *kéntron, from Proto-Indo-European *ḱéntrom — pointed tool.

Ancestry of “centronuclear”, step by step

Step	Language	Word	Meaning
1	English	centro-	central
2	English	centre	Alternative spelling of center
3	Middle English	center	—
4	Middle French	centre	—
5	Latin	centrum	center
6	Ancient Greek	κέντρον	Something with a sharp point: point, spike, spur;...
7	Proto-Hellenic	*kéntron	—
8	Proto-Indo-European	*ḱéntrom	pointed tool

Every word from Proto-Indo-European *ḱéntrom →Every word from Proto-Hellenic *kéntron →Every word from Ancient Greek κέντρον →