submarine chaser
A small naval vessel designed for anti-submarine warfare. Technical military term.
Submarine chasers of the former Imperial Japanese Navy were used for anti-submarine patrols.
A submarine, the type of vessel that a submarine chaser is designed to hunt.
Compound of 駆 (ku, 'drive') + 潜 (sen, 'submerge') + 艇 (tei, 'boat'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.