The Collaborative International Dictionary
Moonsail
Moonsail \Moon"sail`\, n. (Naut.)
A sail sometimes carried in light winds, above a skysail.
--R. H. Dana, Jr.
Wiktionary
moonsail
n. (context nautical English) A moonraker (sail).
Usage examples of "moonsail".
I especially liked the words, skysail and moonsail, and turned them over in my mouth as though I was licking honey.
Stephen looked upon as the bane of the Navy, he was no very good company either, except perhaps for those who could speak knowingly of kites, moonsails, and star-gazers.