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heli-1

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

heli-2

1.
a combining form representing helicopter, in compound words:
helidrop; helilift; helitaxi.
Origin
by analysis of helicopter as heli- (an assumed combining form with -i-) + -copter; cf. copter
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for heli-

heli-

combining form
1.
helicopter: heliport
Word Origin
C20: shortened from helicopter

helio-

combining form
1.
indicating the sun: heliocentric, heliolithic
Word Origin
from Greek, from hēlios sun
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
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