One of the clews or lower corners of a course or a topsail when the middle part or the rest of the sail is furled.
Webster 1828 Edition
Goosewing
GOOSEWING
,
Noun.
goos'wing. In seamen's language, a sail set on a boom on the lee side of a ship; also, the clues or lower corners of a ship's main-sail or fore-sail, when the middle part is furled.