noun, adjective, verb, -rined, -rin⋅ing.| 1. | a vessel that can be submerged and navigated under water, usually built for warfare and armed with torpedoes or guided missiles. |
| 2. | something situated or living under the surface of the sea, as a plant or animal. |
| 3. | Chiefly Northeastern and North Midland U.S. a hero sandwich. |
| 4. | situated, occurring, operating, or living under the surface of the sea: a submarine mountain. |
| 5. | of, pertaining to, or carried on by a submarine or submarines: submarine warfare. |
| 6. | to participate in the operating of a submarine. |
| 7. | to move or slide under something. |
| 8. | Slang.
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| 9. | to attack or sink by submarine. |
submarine
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