Where does “pinnaclum” come from?

pinnaclum (Vulgar Latin) comes from Latin pinnāculum, 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.

Ancestry of “pinnaclum”, step by step

StepLanguageWordMeaning
1Latinpinnāculuma peak, pinnacle
2LatinPinnaA city of the Vestini situated on the eastern slope of the Apennines, now the town of Penne
3Latinpennawing; feather, especially a flight-feather;...
4Proto-Italicpetnāfeather; wing
5Proto-Indo-Europeanpéth₂r̥wing; feather
6Proto-Indo-Europeanpeth₂-to spread out; to fly

Words derived from “pinnaclum

Every word from Proto-Indo-European peth₂-Every word from Proto-Indo-European péth₂r̥Every word from Proto-Italic petnā