IPA: /ˈskaɪseɪl/
KK: /ˈskaɪˌseɪl/
A small square sail that is positioned above the royal sail on a square-rigged ship, used to catch more wind and increase speed.
The crew hoisted the skysail to take advantage of the strong winds.
Skysail is formed from "sky" (from Old Norse *ský*, meaning cloud or sky) and "sail" (from Old English *sægl*, meaning a piece of cloth used to catch the wind). The word "skysail" refers to a sail that is set high on a ship's mast, catching the winds in the upper atmosphere.
Imagine a sail that catches the winds high up in the clouds — that's why a skysail is a sail set in the sky.