Hypertext Webster Gateway: "skysail"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Skysail \Sky"sail\, n. (Naut.)
The sail set next above the royal. See Illust. under {Sail}.
From WordNet (r) 1.7 (wn)
skysail
n : the sail above the royal on a square-rigger
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