Po*lac"ca (?), n. [It. polacca,
polaccra, polacra; cf. F. polaque,
polacre, Sp. polacre,] [Written also polacre.]
1. (Naut.) A vessel with two or three
masts, used in the Mediterranean. The masts are usually of one piece,
and without tops, caps, or crosstrees.
2. (Mus.) See
Polonaise.