/ Dictionary / Index S sine wave: Meaning and Definition of Find definitions for: sine' wave" Pronunciation: [key] — Physics. Physics. a periodic oscillation, as simple harmonic motion, having the same geometric representation as a sine function. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sinew sinewy 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