/ Dictionary / Index S sunup: Meaning and Definition of Find definitions for: sun•up Pronunciation: (sun'up"), [key] — n. sunrise, esp. the time of sunrise. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sunup (Thesaurus) suntans Sun Valley Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language