/ Dictionary / Index N nisus: Meaning and Definition of Find definitions for: ni•sus Pronunciation: (nī'sus), [key] — pl. -sus. an effort or striving toward a particular goal or attainment; impulse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nisus (Thesaurus) Nistru nit 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