
1) Sailboat type
Found on
https://www.crosswordclues.com/clue/polacca

A polacca (or polacre) is a type of seventeenth-century sailing vessel, similar to the xebec. The name is the feminine of `Polish` in the Italian language. The polacca was frequently seen in the Mediterranean. It had three single-pole masts, often with a lateen hoisted on the foremast (which was slanted forward to accommodate the large lateen ya.....
Found on
http://en.wikipedia.org/wiki/Polacca

stately Polish dance; polonaise
Found on
http://phrontistery.info/p.html

• (n.) See Polonaise. • (n.) A vessel with two or three masts, used in the Mediterranean. The masts are usually of one piece, and without tops, caps, or crosstrees.
Found on
http://thinkexist.com/dictionary/meaning/polacca/
Po·lac'ca noun [ Italian
polacca ,
polaccra ,
polacra ; confer French
polaque ,
polacre , Spanish
polacre ,] [ Written also
polacre .]
1. (Nautical) A vessel with two or three masts, used in the Mediterranean. The masts are usually of ...
Found on
http://www.encyclo.co.uk/webster/P/116

A polacca was a 17th century Mediterranean long-distance merchant ship of about 110 tons displacement fitted with three masts and carrying a crew of between 20 and 30.
Found on
http://www.probertencyclopaedia.com/browse/RP.HTM
No exact match found.