Where does “bipennula” come from?

bipennula (Latin) comes from Latin bis, from Latin color, from Ancient Greek μέτρον, from Ancient Greek -τρον, from Proto-Hellenic -tron, from Proto-Indo-European -trom, from Proto-Indo-European -tḗr — Derives agent nouns from verbs, denoting someone...

Ancestry of “bipennula”, step by step

bipennula traces back through two separate lines of ancestry.

via Latin bis

StepLanguageWordMeaning
1Latinbistwice, two times, on two occasions, in two ways
2Latincolorcolour, shade; color; pigment; complexion
3Ancient Greekμέτρονsomething used to measure: measure, rule, weight;...
4Ancient Greek-τρονForms instrument nouns
5Proto-Hellenic-tronForms instrument nouns from verb stems
6Proto-Indo-European-tromForms nouns denoting a tool or instrument
7Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via Latin penna

StepLanguageWordMeaning
1Latinpennawing; feather, especially a flight-feather;...
2Proto-Italicpetnāfeather; wing
3Proto-Indo-Europeanpéth₂r̥wing; feather
4Proto-Indo-Europeanpeth₂-to spread out; to fly
Every word from Proto-Indo-European -tḗrEvery word from Ancient Greek -τρονEvery word from Ancient Greek μέτρον