cor·sair 
(kôrsâr′)
(kôrsâr′)n.
1. A pirate or privateer, especially along the Barbary Coast.
2. A swift pirate ship, often operating with official sanction.
[French corsaire, from Old Provençal corsari, from Old Italian corsaro, from Medieval Latin cursārius, from cursus, plunder, from Latin, run, course; see COURSE.]