/ Dictionary / Index S S wave: Meaning and Definition of Find definitions for: S wave Pronunciation: [key] — Geol. Geol. a transverse earthquake wave that travels through the interior of the earth and is usually the second conspicuous wave to reach a seismograph. Also calledCf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. swatter sway Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language