- a vessel, esp one designed for warfare, capable of operating for protracted periods below the surface of the sea
- (modifier)
- of or relating to a submarine: a submarine captain
- occurring or situated below the surface of the sea: a submarine cable
WordReference Random House Learner's Dictionary of American English © 2026
sub•ma•rine /ˌsʌbməˈrin, ˈsʌbməˌrin/USA pronunciation n. [countable]
adj.
WordReference Random House Unabridged Dictionary of American English © 2026- Nautical, Naval Termsa vessel that can be submerged and moved under water:The submarine dove for the sea bottom.
- Dialect Terms[Chiefly Northeastern and North Midland U.S.]a hero sandwich.
adj.
- situated, occurring, operating, or living under the surface of the sea.
sub•ma•rine
(n. sub′mə rēn′, sub′mə rēn′;adj., v. sub′mə rēn′),USA pronunciation n., adj., v., -rined, -rin•ing.
n.
adj.
v.i.
v.t.
n.
- Nautical, Naval Termsa vessel that can be submerged and navigated under water, usually built for warfare and armed with torpedoes or guided missiles.
- something situated or living under the surface of the sea, as a plant or animal.
- Dialect Terms[Chiefly Northeastern and North Midland U.S.]a hero sandwich.
adj.
- situated, occurring, operating, or living under the surface of the sea:a submarine mountain.
- Nautical, Naval Termsof, pertaining to, or carried on by a submarine or submarines:submarine warfare.
v.i.
- to participate in the operating of a submarine.
- to move or slide under something.
- Slang Terms
- to be thrown under the steering wheel of the vehicle one is driving during a frontal crash.
- to be thrown out of one's seat belt in such a crash.
v.t.
- to attack or sink by submarine.
- 1640–50; 1895–1900 for def. 1; sub- + marine
- 3. See hero sandwich.
Collins Concise English Dictionary © HarperCollins Publishers::
submarine /ˈsʌbməˌriːn; ˌsʌbməˈriːn/ n
'submarine' also found in these entries (note: many are not synonyms or translations):
cable
- conning tower
- crash dive
- dive
- hunter-killer
- hydroplane
- periscope
- Polaris
- Saint-Nazaire
- SLCM
- snorkel
- sub
- submariner
- submarine sandwich
- submersible
- torpedo
- triad
- Trident
- trim
- tsunami
- U-boat
- Zeebrugge
- air-breather
- air strike
- alfa
- atomic
- Baltimore Canyon
- blip
- bottom
- break
- breather
- Brest
- broach
- Bushnell
- button
- continental rise
- delta
- escape hatch
- fin
- fleet ballistic missile submarine
- harpoon
- hero sandwich
- hotel
- launch
- leader cable
- life-support
- Lusitania
- mid-ocean ridge
- minisub
- nautilus