moonsail
/ˈmunˌseɪl/
noun
- A small, light sail set above a skysail on a sailing ship, used in light winds.
- In the age of sail, a moonsail was the highest sail on a square-rigged ship.
- Only the most skilled sailors could handle the moonsail in rough weather.
- The captain ordered the crew to raise the moonsail to catch the faint breeze.