helio-

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a combining form meaning “sun,” used in the formation of compound words: heliolatry.

Also, especially before a vowel, heli-.

Origin:
< Greek, combining form of hḗlios sun

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To helio-

Collins

World English Dictionary

helio- or (before a vowel) heli-

—*combining form*
	indicating the sun: heliocentric; heliolithic

[from Greek, from hēlios sun]

heli- or (before a vowel) heli-

—*combining form*

[from Greek, from hēlios sun]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Helio- is always a great word to know.