Real Dictionary

torpedo
If a ship is torpedoed, it is hit, and usually sunk, by a torpedo or torpedoes.
countable noun: A torpedo is bomb that is shaped like a tube and that travels under water.

torpedo in American English
electric ray
to attack, damage, or destroy with or as with a torpedo
intransitive verb: to attack, damage, or sink a ship with torpedoes
noun: a self-propelled, cigar-shaped missile containing explosives and often equipped with a homing device, launched from a submarine or other warship, for destroying surface vessels or other submarines
transitive verb: to attack, hit, damage, or destroy with torpedoes

torpedo in British English
noun: a cylindrical self-propelled weapon carrying explosives that is launched from aircraft, ships, or submarines and follows an underwater path to hit its target