/ Dictionary / Index G ground sluice: Meaning and Definition of Find definitions for: ground' sluice" Pronunciation: [key] — Mining. Mining. a trench, cut through a placer or through bedrock, through which a stream is diverted in order to dislodge and wash the gravel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ground sloth groundspeed Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language