semisubmersible rig

semisubmersible

[sem-ee-suhb-mur-suh-buhl, sem-ahy-]
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:
1960–65; semi- + submersible

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
semisubmersible rig
 
n
Sometimes shortened to: semisubmersible (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

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