noun, plural he·li·os. Informal.

a heliogram.
a heliograph.

Origin of helio

by shortening


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. 2019

Examples from the Web for helio

Contemporary Examples of helio

  • BREAKOUT MOMENT: Shaking her hips—Elvis be damned—during a too-hot-for-prime time samba with partner Helio Castroneves in 2007.

    The Daily Beast logo
    Breakout Blondes

    Alison Prato

    May 26, 2009

Historical Examples of helio

British Dictionary definitions for helio


before a vowel heli-

combining form

indicating the sunheliocentric; heliolithic

Word Origin for helio-

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).

Online Etymology Dictionary, © 2010 Douglas Harper