/ Dictionary / Index O ondograph: Meaning and Definition of Find definitions for: on•do•graph Pronunciation: (on'du-graf", -gräf"), [key] — n. an instrument for graphically recording oscillatory variations, as in alternating currents. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. onding one Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language