Breadcrumb Home > Dictionary > Index R rough lemon: Meaning and Definition of Find definitions for: rough' lem'on Pronunciation: [key] a variety of lemon that has orange-yellow, rough-skinned fruit and is used as a rootstock for the cultivation of other citrus fruits. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rough-legged hawk roughneck ✖ Related Content Daily Word Quiz: derogate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language