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semisubmersible

[sem-ee-suh b-mur-suh-buh l, sem-ahy-]
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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.
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adjective
  1. of, for, or pertaining to a semisubmersible.
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Origin of semisubmersible

First recorded in 1960–65; semi- + submersible
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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 gasSometimes shortened to: semisubmersible
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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