/ Dictionary / Index H highwall: Meaning and Definition of Find definitions for: high•wall Pronunciation: (hī'wôl"), [key] — n. the unexcavated face of exposed overburden and coal in a surface mine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. high-voltage high water Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language