/ Dictionary / Index R rock bolt: Meaning and Definition of Find definitions for: rock' bolt" Pronunciation: [key] — Mining, Civ. Engin. Mining,Civ. Engin. a steel or fiberglass bolt inserted and anchored in a hole drilled in rock to prevent caving of the roof of a tunnel or subterranean chamber. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rock blenny rock bottom Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language