Definition of stud-sail in English:

stud-sail

noun

Nautical
  • On a square-rigged ship: an additional sail set at the side of a principal sail to increase a vessel's speed in a fair wind; = "studdingsail".

Origin

Late 18th century; earliest use found in The London Chronicle. Apparently shortened from studdingsail.

Pronunciation

stud-sail

/ˈstʌdseɪl//ˈstʌdsl/