/ Dictionary / Index N noctiluca: Meaning and Definition of Find definitions for: noc•ti•lu•ca Pronunciation: (nok"tu-l'ku), [key] — pl. -cae a dinoflagellate of the genus Noctiluca, capable of producing light and, in groups, of causing a luminous appearance of the sea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: noctiluca (Thesaurus) nocti- noctilucent 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