Definitions
Century Dictionary and Cyclopedia
- n. Nautical, a sail set above a skysail. Also called moon-raker.
Wiktionary
- n. nautical A moonraker (sail).
GNU Webster's 1913
- n. (Naut.) A sail sometimes carried in light winds, above a skysail.
Examples
“The square sails on the mainmast are called, when eight are carried, the mainsail, lower and upper maintopsails, lower and upper maintopgallants, main-royal, main-skysail, and the moonsail.”
Lists
These user-created lists contain the word ‘moonsail’.
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The Aubrey/Maturin List I'm Gonna Mak...
I'm wading through Patrick O'Brian's Aubrey/Maturin novels one by one, and someday, I'll wade through them again and list all the words I learned while reading them.
Edit: I started ma...studdingsail, carronade, mumchance, grumlin-futtocks, crosscat-harpings, holystone, sennit, orlop, orchitis, negus, kevel, altumal and 1112 more...
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and Bristol fashion
being items related to boats, ships, sailing, nautical and naval lore &c.
sloop, frigate, brigantine, brig, grog, schooner, rig, sail, canvas, jib, forestay, cutter and 150 more...
Tweets
Looking for tweets for moonsail.

chained_bear "...in her character as a prudent merchantman she had no royal masts above her stump topgallants, and they could hardly be sent up man-of-war fashion without exciting suspicion; nor could royals, skysails, moonsails, stargazers and other flying-kites, all very useful in these mere zephyrs, where the higher air moved somewhat faster than that just over the sea."
--Patrick O'Brian, The Reverse of the Medal, 92 Feb 24, 2008