/ Dictionary / Index O open-pit: Meaning and Definition of Find definitions for: o•pen-pit Pronunciation: (ō'pun-pit"), [key] — adj. Mining. noting or pertaining to a type of surface mining in which massive, usually metallic mineral deposits are removed by cutting benches in the walls of a broad, deep funnel-shaped excavation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open order open plan Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language