Where does “retromammillary” come from?

retromammillary (English) comes from English retro, from French rétro, from French rétroviseur, from French rétro-, from Latin retrō, from Latin dūcere, from Proto-Italic doukō, from Proto-Indo-European déwketi — to pull, to draw; to lead.

Ancestry of “retromammillary”, step by step

retromammillary traces back through two separate lines of ancestry.

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

via English mammillary

StepLanguageWordMeaning
1EnglishmammillaryResembling a breast or nipple in shape or form;...
2Latinmammillāris
3Latinmamillabreast; nipple, teat
4Latinmammaa breast; an udder; a pap; a teat, a dug
5Latinferōto bear; to carry
6Proto-Italicferōcarry, bear
7Proto-Indo-Europeanbʰéretito be carrying
8Proto-Indo-Europeanbʰēr-shiny, light brown
Every word from Proto-Indo-European dewk-Every word from Proto-Indo-European déwketiEvery word from Proto-Italic doukō