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helio-

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  1. a combining form meaning “sun,” used in the formation of compound words: heliolatry.
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Also especially before a vowel, heli-.

Origin of helio-

< Greek, combining form of hḗlios sun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for helio-

helio-

before a vowel heli-

combining form
  1. indicating the sunheliocentric; heliolithic
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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

Word Origin and History for helio-

word-forming element meaning "sun," from Greek helio-, comb. form of helios "sun" (see sol).

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Online Etymology Dictionary, © 2010 Douglas Harper