/ Dictionary / Index R rock salt: Meaning and Definition of Find definitions for: rock' salt" Pronunciation: [key] common salt occurring in extensive, irregular beds in rocklike masses. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rockrose family rockshaft Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language