The story
- Proto-Indo-European*plew-
- Proto-Indo-European*plewk-
- Proto-Indo-European*plewk-smeh₂
- Proto-Italic*plouksmā
- Latinplūma
- Proto-Indo-European*h₃ed-
- Proto-Indo-European*h₃édosder.?
- Latinplūmōsu
- English todayplumose
Learned borrowing from Latin plūmōsus (“feathered”, from plūma (“feather”) + -ōsus (“-ful, -ose”)). By surface analysis, plume + -ose. Compare French plumeux. Piecewise doublet of plumous.
Etymology from Wiktionary, CC BY-SA 4.0.