The Collaborative International Dictionary of English v.0.48:

Coursey \Cour"sey\ (k?r"s?), n. [Cf. OF. corsie, coursie,
   passage way to the stern. See Course, n. ] (Naut.)
   A space in the galley; a part of the hatches. --Ham. Nav.
   Encyc.
   [1913 Webster]