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| sem·i·sub·mers·i·ble [ sèmmee səb múrssəb'l, sèmmī səb múrssəb'l ] (plural sem·i·sub·mers·i·bles) or sem·i·sub·mers·i·ble rig (plural sem·i·sub·mers·i·ble rigs) |
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oil-drilling platform: a self-propelled oil-drilling platform resting on vertical pontoons that can be flooded for stability in deep water
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