/ Dictionary / Index R rock elm: Meaning and Definition of Find definitions for: rock' elm" Pronunciation: [key] an elm, Ulmus thomasii, of eastern North America, having deeply furrowed, grayish-brown bark. the hard, heavy wood of this tree, used for making furniture and in the manufacture of various types of containers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Rockefeller rocker Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language