/ Dictionary / Index N nostoc: Meaning and Definition of Find definitions for: nos•toc Pronunciation: (nos'tok), [key] — n. any freshwater, blue-green alga of the genus Nostoc, often occurring in jellylike colonies in moist places. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nostoc (Thesaurus) no-stick nostology Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language