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Webster 1913 Edition

Noun.

A mill for grinding grain; especially, a mill for grinding grists, or portions of grain brought by different customers; a custom mill.

Noun.

A mill for grinding grain.

See also: grist mill

gristmill ‎(plural gristmills)

A mill that grinds grain, especially grain brought by a farmer to be exchanged for the flour (less a percentage)