Where does “endometrium” come from?

endometrium (Latin) comes from Ancient Greek μήτρα, from Ancient Greek μήτηρ, from Proto-Hellenic mā́tēr, from Proto-Indo-European méh₂tēr — mother.

Ancestry of “endometrium”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	μήτρα	womb; the pith or heart of wood; a queen wasp
2	Ancient Greek	μήτηρ	mother; source or origin
3	Proto-Hellenic	mā́tēr	mother
4	Proto-Indo-European	méh₂tēr	mother