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I thought heli is more like a screw. (Not claiming that it is, but that was my understanding)
The word is not "heli" though. It's "helico".
Like in the helicoprion (a shark with a spiral think on it's mouth) or a helicograph (a tool to draw spirals).
Or, y'know, a helix.
Yes, that is where it comes from.
https://www.collinsdictionary.com/dictionary/english/helico
https://www.dictionary.com/browse/helico-
Doesn't change the fact that the word helicopter splits into "helico" and "pter" with the later meaning wing or feather in greek.
https://www.merriam-webster.com/dictionary/pter-
It's a helico-pter "spiraling wing", not a heli-copter.
TIL
The dictionary definition is "Anything twisted, winding, or spiral." but an inference can be made