/ Dictionary / Index S seismograph: Meaning and Definition of Find definitions for: seis•mo•graph Pronunciation: (sīz'mu-graf", -gräf", sīs'-), [key] — n. any of various instruments for measuring and recording the vibrations of earthquakes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: seismograph (Thesaurus) seismogram seismography 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