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WordReference Random House Unabridged Dictionary of American English © 2024heli-,1 - var. of helio- before a vowel:helianthus.
heli-,2 - a combining form representing helicopter in compound words:helidrop;helilift;helitaxi.
- compare copter by analysis of helicopter as heli- (an assumed combining form with -i-) + -copter
Collins Concise English Dictionary © HarperCollins Publishers:: heli- combining form - helicopter: heliport
Etymology: 20th Century: shortened from helicopter he•li•o (hē′lē ō′),USA pronunciation n., pl. -li•os. [Informal.]- Optics, Informal Termsa heliogram.
- Optics, Informal Termsa heliograph.
helio-, - a combining form meaning "sun,'' used in the formation of compound words:heliolatry.
Also,[esp. before a vowel,] heli-. - Greek, combining form of hé̄lios sun
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