\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}.