Where does “окситоцин” come from?

окситоцин (Russian) comes from Ancient Greek τόκος, from Ancient Greek τίκτω, from Proto-Hellenic tíktō, from Proto-Indo-European teḱ- — to sire, beget.

Ancestry of “окситоцин”, step by step

окситоцин traces back through two separate lines of ancestry.

via Ancient Greek τόκος

Step	Language	Word	Meaning
1	Ancient Greek	τόκος	childbirth, parturition; offspring; interest
2	Ancient Greek	τίκτω	I beget, give birth to; I bear, produce, generate
3	Proto-Hellenic	tíktō	to beget
4	Proto-Indo-European	teḱ-	to sire, beget

via Ancient Greek ὀξύς

Step	Language	Word	Meaning
1	Ancient Greek	ὀξύς	sharp, pointed; sharp, keen; quick, hasty, swift
2	Proto-Indo-European	h₂eḱ-	sharp

Every word from Proto-Indo-European teḱ- →Every word from Proto-Hellenic tíktō →Every word from Ancient Greek τίκτω →