/ Dictionary / Index W wall rock: Meaning and Definition of Find definitions for: wall' rock" Pronunciation: [key] — Mining. Mining. the rock forming the walls of a vein. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. wallposter wall rue Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language