/ Dictionary / Index G groundspeed: Meaning and Definition of Find definitions for: ground•speed Pronunciation: (ground'spēd"), [key] — n. the speed of an aircraft with reference to the ground. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: groundspeed (Thesaurus) ground sluice ground squirrel Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language