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Webster 1913 Edition

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[From

Mackinac

, the State of Michigan, where blankets and other stores were distributed to the Indians.]

A thick blanket formerly in common use in the western part of the United States.

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mackinaw ‎(plural mackinaws)

A heavy, woolen cloth.
A blanket made of wool, formerly distributed to the Amerindians by the U.S. government.
A flat-bottomed cargo boat; mackinaw boat.