Where does “feminine” come from?

feminine (Middle English) comes from Old French feminin, from Latin femininus, from Latin -inus, from Proto-Italic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “feminine”, step by step

feminine traces back through two separate lines of ancestry.

via Old French feminin

StepLanguageWordMeaning
1Old Frenchfeminin
2Latinfemininusfeminine; of or relating to the feminine gender
3Latin-inusOf or pertaining to; -ine
4Proto-Italic-īnosof/belonging to
5Proto-Indo-European-iHnosCreates adjectives of materials
6Proto-Indo-European-no-adjectival suffix

via Old French feminine

StepLanguageWordMeaning
1Old Frenchfeminine
Every word from Proto-Indo-European -no-Every word from Latin -inusEvery word from Proto-Italic -īnos
feminine — Etymology, Origin & Word History | Etymology Explorer