torpedo boat

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A small, fast warship equipped for firing torpedoes.

Century Dictionary and Cyclopedia

1. n. Nautical, a boat from which a torpedo is operated; especially, a small swift steamer carrying one or more offensive torpedoes for use against an enemy's ships.

Wiktionary

1. n. a small, high-speed warship designed to fire torpedoes, especially in coastal waters

GNU Webster's 1913

1. n. a vessel adapted for carrying, launching, operating, or otherwise making use of, torpedoes against an enemy's ship., especially, a small, fast boat with tubes for launching torpedoes.

WordNet 3.0

1. n. small high-speed warship designed for torpedo attacks in coastal waters