- a combining form meaning “sun,” used in the formation of compound words: heliolatry.
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
before a vowel heli-
- indicating the sunheliocentric; heliolithic
from Greek, from hēlios sun
Word Origin and History for helio-
word-forming element meaning "sun," from Greek helio-, comb. form of helios "sun" (see sol).
Online Etymology Dictionary, © 2010 Douglas Harper