noun
a warship designed to operate under water
• Syn: ↑submersible
• Ant: ↑surface ship (for: ↑submersible)
• Derivationally related forms: ↑submersible (for: ↑submersible)
• Hypernyms: ↑warship, ↑war vessel, ↑combat ship
Useful english dictionary. 2012.