Breadcrumb Home > Dictionary > Index S sienna: Meaning and Definition of Find definitions for: si•en•na Pronunciation: (sē-en'u), [key] — n. a ferruginous earth used as a yellowish-brown pigmentor, after roasting in a furnace, as a reddish-brown pigment the color of such a pigment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sienna (Thesaurus) Sienkiewicz Siepi ✖ Related Content Daily Word Quiz: restive Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language