sem·i·sub·mers·i·ble (s m  -s b-mûr s-bl, sm -)n. A seagoing, self-propelled barge that rides at anchor, stands on partially submerged vertical legs on submerged pontoons, and serves as living quarters and a base of operations in offshore drilling. Also called semisubmersible rig. sem i·sub·mersi·ble adj. |
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