/ Dictionary / Index S sundial: Meaning and Definition of Find definitions for: sun•di•al Pronunciation: (sun'dī"ul, -dīl"), [key] — n. an instrument that indicates the time of day by means of the position, on a graduated plate or surface, of the shadow of the gnomon as it is cast by the sun. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sundial (Thesaurus) sundew sun disk Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language