staysail

from WordNet (r) 3.0 (2006)
staysail
    n 1: a fore-and-aft sail set on a stay (as between two masts)
from The Collaborative International Dictionary of English v.0.48
Staysail \Stay"sail`\ (st[=a]"s[=a]l`;among sailors,
   st[=a]"s'l), n. (Naut.)
   Any sail extended on a stay.
   [1913 Webster]
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