/kæsˈtɛlɛt/ or /kɑːsˈtɛlɛt/ (UK) and /kæsˈtɛlɛt/ (US)

Definitions

1. noun

A small tower or fortress, especially one used as a fortified observation post or for signaling.

“The medieval lord built a castelet at the top of the hill to survey the surrounding countryside.”