/ Dictionary / Index N Nipissing: Meaning and Definition of Find definitions for: Nip•is•sing Pronunciation: (nip'u-sing), [key] — n. a lake in SE Canada, in Ontario, N of Georgian Bay. 330 sq. mi. (855 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Nipigon Nipmuck Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language