Studdingsail
ahd-5
noun.
A narrow rectangular sail set from extensions of the yards of square-rigged ships.
The Century Dictionary and Cyclopedia
noun.
A sail set beyond the leeches of some of the principal squaresails during a fair wind, very seldom used.
cross-reference
flying studdingsails
fore-studdingsail
studdingsail irons
studdingsail-booms