n.

1. 單桅帆船[C]
   A sloop has only one central pole.

   單桅帆船只有一個中央桅杆。

n.

1. a one-masted sailing boat with a mainsail and jib rigged fore and aft.
2. (also sloop of war) historical a small square-rigged sailing warship with two or three masts.
3. a small anti-submarine warship used for convoy escort in the Second World War.