/ Dictionary / Index R romaine: Meaning and Definition of Find definitions for: ro•maine Pronunciation: (rō-mān', ru-), [key] — n. Also calleda variety of lettuce, Lactuca sativa longifolia, having a cylindrical head of long, relatively loose leaves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: romaine (Thesaurus) Romaic Romains Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language