/ Dictionary / Index I ionosonde: Meaning and Definition of Find definitions for: i•on•o•sonde Pronunciation: (ī-on'u-sond"), [key] — n. a pulsed radar device used to measure the height of ionospheric layers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ionophore ionosphere Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language