Definitions
1.nounAn obsolete type of sailing warship with a single continuous gun deck, typically used for patrolling, blockading, etc, but not in line of battle.
2.nounA 19th-century warship combining sail and steam propulsion, typically of ironclad timber construction, supplementing and superseding sailing ships of the battle line until made obsolete by the development of the solely steam-propelled iron battleship.
3.nounA modern type of warship, smaller than a destroyer, originally (WWII) introduced as an anti-submarine vessel but now general purpose.
4.nounA frigatebird.