• (n.) Same as Polacca, 1.
Po·la'cre noun Same as Polacca , 1. 
Polacres were a type of 18th century Mediterranean sailing ship so called because their masts were formed from a single spar and they had neither tops nor cross-trees. Two forms of polacres were built, brig polares were two-masted, normally square rigged on both masts, but occasionally lateen-rigged on the mizzen; shi polacres were larger, sometime...