/ Dictionary / Index R roughing-in: Meaning and Definition of Find definitions for: rough•ing-in Pronunciation: (ruf'ing-in'), [key] — n. Building Trades. the act or process of applying a base coat of plaster to a masonry surface. the act or process of installing plumbing that will later be concealed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: roughing-in (Thesaurus) roughhouse roughing mill Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language