ringsail
/ˈrɪŋseɪl/Definitions
1. noun
A fore-and-aft sail with a loop at the foot, set on a boom.
“The sailor expertly trimmed the ringsail to optimize the boat’s speed.”
2. noun
A looped or ringed sail, especially one with a loop at the foot.
“The captain ordered the crew to raise the ringsail for better visibility.”