A coin of several countries in Europe, struck in the dominions of a duke. It is of silver or gold. The silver ducat is generally of the value of four shillings and sixpence sterling, equal to an American dollar, or to a French crown, and the gold ducat of twice the value.

A coin, either of gold or silver, of several countries in Europe; originally, one struck in the dominions of a duke.

A silver coin, struck chiefly in Italy, of the value of about four shillings and eight pence sterling, or nearly 104 cents. The gold ducatoon of Holland is worth twenty florins.

A silver coin of several countries of Europe, and of different values.