/ Dictionary / Index H helioscope: Meaning and Definition of Find definitions for: he•li•o•scope Pronunciation: (hē'lē-u-skōp"), [key] — n. a telescope for viewing the sun, adapted to protect the eye of the viewer from the sun's glare. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Helios heliosphere Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language