n. A comparatively large, light headsail such as a spinnaker, used when going before the wind.
balloon sail
n (Nautical Terms) nautical a large light bellying sail used in light winds. Compare spinnakerThesaurus
Noun
1.
balloon sail - any light loose sail sail, canvass, canvas, sheet - a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel