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I thought heli is more like a screw. (Not claiming that it is, but that was my understanding)
The dictionary definition is "Anything twisted, winding, or spiral." but an inference can be made
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