/ Dictionary / Index N Niagara-on-the-Lake: Meaning and Definition of Find definitions for: Ni•ag•a•ra-on-the-Lake Pronunciation: (nī-ag'ru-on-u-lāk', -ôn-, -ag'ur-u), [key] — n. a town in SE Ontario, in S Canada, on Lake Ontario, at the mouth of the Niagara River, on the border between Canada and New York. 12,186. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Niagara green Niah Cave Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language