skysail

from WordNet (r) 3.0 (2006)
skysail
    n 1: the sail above the royal on a square-rigger
from The Collaborative International Dictionary of English v.0.48
Skysail \Sky"sail\, n. (Naut.)
   The sail set next above the royal. See Illust. under {Sail}.
   [1913 Webster]
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