Where does “tubo-ovarian” come from?

tubo-ovarian (English) comes from English ovarian, from French ovarien, from French ovaire, from Latin ovarium, from Latin -ārium, from Latin -um, from Proto-Italic *-om, from Proto-Indo-European *-oHom.

Ancestry of “tubo-ovarian”, step by step

tubo-ovarian traces back through two separate lines of ancestry.

via English ovarian

StepLanguageWordMeaning
1EnglishovarianRelating to the ovaries
2Frenchovarienovarian
3Frenchovaireovary
4Latinovariumovary
5Latin-āriumused primarily to form nouns of purpose from other nouns, such as places where things are kept or objects used for a particular end
6Latin-umnominative neuter singular of -us; accusative...
7Proto-Italic*-om
8Proto-Indo-European*-oHom

via English tubo

StepLanguageWordMeaning
1Englishtubo
Every word from Proto-Indo-European *-oHom