Where does “treetop” come from?

Treetop comes from English tree and top, with tree deriving from Middle English tre, from Proto-Germanic trewwō, ultimately from Proto-Indo-European dóru meaning wood or tree.

treetop (English): The crown or uppermost branches of a tree

Definitions

  1. The crown or uppermost branches of a tree

Ancestry of “treetop”, step by step

treetop traces back through two separate lines of ancestry.

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,...

via English tree

StepLanguageWordMeaning
1EnglishtreeA perennial woody plant, not exactly defined, but...
2Middle EnglishtreA tree or a plant that resembles one
Every word from Proto-Indo-European dumb-
treetop — Etymology, Origin & Word History | Etymology Explorer