Etymology
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Mackinaw

port and island in Michigan in the straits connecting lakes Michigan and Huron, from Mackinac, from Ojibway (Algonquian) mitchimakinak "many turtles," from mishiin- "be many" + mikinaak "snapping turtle."

As a type of flat-bottomed, flat-sided boat with a sharp prow and a square stern, 1812, so called because used on the Great Lakes. As a type of heavy blanket given to the Indians by the U.S. government, it is attested from 1822, so called because the fort there was for many years the most remote U.S. spot in the Northwest and many Native Americans received their supplies there..

updated on October 26, 2018

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Definitions of Mackinaw from WordNet

mackinaw (n.)
a short plaid coat made of made of thick woolen material;
Synonyms: Mackinaw coat
mackinaw (n.)
a thick plaid blanket formerly used in the northwestern United States;
Synonyms: Mackinaw blanket
mackinaw (n.)
a flat-bottomed boat used on upper Great Lakes;
Synonyms: Mackinaw boat
mackinaw (n.)
a heavy woolen cloth heavily napped and felted, often with a plaid design;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.