/ Dictionary / Index N Neisse: Meaning and Definition of Find definitions for: Neis•se Pronunciation: (nī'su), [key] — n. a river in N Europe, flowing N from the NW Czech Republic along part of the boundary between Germany and Poland to the Oder River. 145 mi. (233 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Nei Mongol neisseria Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language