Where does “retromaxillar” come from?

retromaxillar (English) comes from English maxillar, from Latin maxillāris, from Latin maxilla, from Latin -illa, from Latin -illus, from Latin -lus, from Proto-Italic -elos, from Proto-Indo-European -e-lós — Forms agent nouns from verbal roots.

Ancestry of “retromaxillar”, step by step

retromaxillar traces back through two separate lines of ancestry.

via English maxillar

StepLanguageWordMeaning
1Englishmaxillarmaxillary
2Latinmaxillārisof or pertaining to the jaw; maxillary
3Latinmaxillajaw, jawbone, bone of the upper jaw; lower part...
4Latin-illainflection of -illus: ## nominative/vocative...
5Latin-illusUsed to form adjectives from nouns
6Latin-lusAlternative form of -ulus; diminutive suffix
7Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
8Proto-Indo-European-e-lós
9Proto-Indo-European-lósForms agent nouns from verbal roots

via English retro

StepLanguageWordMeaning
1EnglishretroOf, or relating to, the past, past times, or the...
2Frenchrétroshortening of rétroviseur, mirror; retro
3Frenchrétroviseurrear-view mirror
4Frenchrétro-retro-, back, behind
5Latinretrōback, backwards, behind
6Latindūcere
7Proto-Italicdoukōlead
8Proto-Indo-Europeandéwketi
9Proto-Indo-Europeandewk-to pull, to draw; to lead
Every word from Proto-Indo-European -lósEvery word from Latin -lusEvery word from Latin -illus