Where does “mesoendodermal” come from?

mesoendodermal (English) comes from English endodermal, from English endoderm, from French endoderme, from French endo-, from Ancient Greek ἔνδον, from Proto-Hellenic éndon, from Proto-Indo-European h₁n̥dóm, from Proto-Indo-European h₁n̥dó — in.

Ancestry of “mesoendodermal”, step by step

StepLanguageWordMeaning
1EnglishendodermalOf or pertaining to the endoderm
2EnglishendodermOne of the three tissue layers in the embryo of a...
3Frenchendodermeendoderm
4Frenchendo-end-/endo-
5Ancient Greekἔνδονin, within
6Proto-Hellenicéndon
7Proto-Indo-Europeanh₁n̥dóminside
8Proto-Indo-Europeanh₁n̥dóinto, inside
9Proto-Indo-Europeanh₁énin
Every word from Proto-Indo-European h₁én