Where does “topmast” come from?

Topmast comes from English top and mast, with mast deriving from Old Norse mastr, ultimately from Proto-Indo-European meh₂ǵ- meaning to knead or mix.

topmast (English): The highest mast in a fore-and-aft-rigged ship;...

Definitions

  1. The highest mast in a fore-and-aft-rigged ship;...

Ancestry of “topmast”, step by step

topmast traces back through two separate lines of ancestry.

via English Mast

StepLanguageWordMeaning
1EnglishMast
2Frenchmassea paste, a dough; large amount or quantity of...
3Old Frenchmacemace weapon
4Vulgar Latinmattia
5LatinmateolaThe meaning of this term is uncertain....
6Latin-ulusUsed to form a diminutive of a noun, indicating...
7Proto-Italic-olos
8Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
9Proto-Indo-European-e-lós
10Proto-Indo-European-lósForms agent nouns from verbal roots

via English top

StepLanguageWordMeaning
1EnglishtopThe highest or uppermost part of something; A...
2Middle EnglishtopThe summit or top of something, especially a...
3Old Englishtopptop, summit (of something)
4Proto-West Germanic*topptop, summit, crest
5Proto-Germanictuppaztuft, plait; top, summit
6Proto-Indo-Europeandumb-tail, rod, staff, pole, penis; tail, rod, staff,...

Words derived from “topmast

Every word from Proto-Indo-European -lós