/ Dictionary / Index R rockshaft: Meaning and Definition of Find definitions for: rock•shaft Pronunciation: (rok'shaft", -shäft"), [key] — n. Mach. an oscillating shaft. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rock salt rock-shelter 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