/ Dictionary / Index U ultramarine: Meaning and Definition of Find definitions for: ul•tra•ma•rine Pronunciation: (ul"tru-mu-rēn'), [key] — adj. of the color ultramarine. beyond the sea. —n. a blue pigment consisting of powdered lapis lazuli. a similar artificial blue pigment. any of various other pigments. a deep-blue color. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ultramarine (Thesaurus) ultramarathon ultrametamorphism Related Content Daily Word Quiz: circumspect Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language