Where does “foetomaternal” come from?

foetomaternal (English) comes from English maternal, from Middle English maternal, from Middle French maternel, from Latin māternus, from Latin -nus, from Proto-Italic -nos, from Proto-Indo-European -nós — Creates verbal adjectives from roots.

Ancestry of “foetomaternal”, step by step

StepLanguageWordMeaning
1EnglishmaternalOf or pertaining to a mother; having the...
2Middle Englishmaternal
3Middle Frenchmaternelmaternal
4Latinmāternusof or pertaining to a mother, maternal
5Latin-nus-an
6Proto-Italic-nosCreates verbal adjectives from verb stems
7Proto-Indo-European-nósCreates verbal adjectives from roots
Every word from Proto-Indo-European -nós