Where does “pinniform” come from?

pinniform (English) comes from Latin Pinna, from Latin penna, from Proto-Italic petnā, from Proto-Indo-European péth₂r̥, from Proto-Indo-European peth₂- — to spread out; to fly.

pinniform (English): Shaped like a fin or feather

Definitions

  1. Shaped like a fin or feather

Ancestry of “pinniform”, step by step

StepLanguageWordMeaning
1LatinPinnaA city of the Vestini situated on the eastern slope of the Apennines, now the town of Penne
2Latinpennawing; feather, especially a flight-feather;...
3Proto-Italicpetnāfeather; wing
4Proto-Indo-Europeanpéth₂r̥wing; feather
5Proto-Indo-Europeanpeth₂-to spread out; to fly
Every word from Proto-Indo-European peth₂-Every word from Proto-Indo-European péth₂r̥Every word from Proto-Italic petnā