/ Dictionary / Index N Niemen: Meaning and Definition of Find definitions for: Nie•men Pronunciation: (nē'mun Pol. nye'men), [key] — n. a river in the W Soviet Union in Europe, flowing into the Baltic: called Memel in its lower course. 565 mi. (910 km) long. Lithuanian,Russian, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Niemann-Pick disease Niemeyer Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language