/ Dictionary / Index H heliopause: Meaning and Definition of Find definitions for: he•li•o•pause Pronunciation: (hē'lē-u-pôz"), [key] — n. Astron. the boundary of the heliosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heliopause (Thesaurus) heliometer heliophyte Related Content Daily Word Quiz: voracious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language