Where does “rachis” come from?

rachis (Latin) comes from Ancient Greek ῥάχις — chine, lower part of the back; spine or backbone;...

Ancestry of “rachis”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ῥάχις	chine, lower part of the back; spine or backbone;...

rachis — Etymology, Origin & Word History | Etymology Explorer