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heli-1

  1. variant of helio- before a vowel: helianthus.
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heli-2

  1. a combining form representing helicopter in compound words: helidrop; helilift; helitaxi.
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Origin of heli-2

by analysis of helicopter as heli- (an assumed combining form with -i-) + -copter; cf. copter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for heli-

heli-

combining form
  1. helicopterheliport
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Word Origin

C20: shortened from helicopter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012