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semisubmersible

[sem-ee-suh b-mur-suh-buh l, sem-ahy-] /ˌsɛm i səbˈmɜr sə bəl, ˌsɛm aɪ-/
noun
1.
Also called semisubmersible rig. a self-propelled barge that is mounted on partially submerged legs supported by underwater pontoons, rides at anchor, and serves as a work base and living quarters in deep offshore drilling operations.
adjective
2.
of, for, or pertaining to a semisubmersible.
Origin
1960-1965
1960-65; semi- + submersible
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for semisubmersible rig

semisubmersible rig

noun
1.
(in the oil industry) a type of drilling platform that floats supported by underwater pontoons, with much of its structure below the water line for stability in high winds: usually used only for exploratory drilling for oil or gas Sometimes shortened to semisubmersible
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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