Where does “Zellkern” come from?

Zellkern (German) comes from German kern, from Middle High German kerne, from Old High German kerno, from Proto-Germanic kernô, from Proto-Indo-European ǵr̥h₂nóm, from Proto-Indo-European ǵr̥h₂nós, from Proto-Indo-European ǵerh₂- — to grow old, to mature.

Zellkern (German): nucleus

Definitions

nucleus

Ancestry of “Zellkern”, step by step

Zellkern traces back through two separate lines of ancestry.

via German kern

Step	Language	Word	Meaning
1	German	kern	kernel
2	Middle High German	kerne	—
3	Old High German	kerno	core; pith
4	Proto-Germanic	kernô	kernel, core
5	Proto-Indo-European	ǵr̥h₂nóm	grain
6	Proto-Indo-European	ǵr̥h₂nós	matured, grown old
7	Proto-Indo-European	ǵerh₂-	to grow old, to mature

via German Zelle

Step	Language	Word	Meaning
1	German	Zelle	cell
2	Old High German	zella	chamber
3	Latin	cella	a small room, a hut, storeroom; a barn, granary;...

Every word from Proto-Indo-European ǵerh₂- →Every word from Proto-Indo-European ǵr̥h₂nós →Every word from Proto-Indo-European ǵr̥h₂nóm →