/ Dictionary / Index M Mackinac: Meaning and Definition of Find definitions for: Mack•i•nac Pronunciation: (mak'u-nô"), [key] — n. a strait between the peninsulas of Upper Michigan and Lower Michigan, connecting lakes Huron and Michigan. an island in Lake Huron at the entrance of this strait. 517; 3 mi. (5 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mackerel sky Mackinac Bridge Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language