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Obsolete unit of measure for salt
A moy was a measure for salt, used in British colonial North America. It amounted to about 15 bushels. It likely derives from the Portuguese moio and the trade in salt between North America and the Azores. Alternatively, the term may have come from the Scots, moy - a certain measure.
Jameison, John (1880). An Etymological Dictionary of the Scottish Language: To which is Prefixed, a Dissertation on the Origin of the Scottish Language. Vol. 3. A. Gardner.