[ sem-ee-suh b-mur-suh-buh l, sem-ahy- ]
/ ˌsɛm i səbˈmɜr sə bəl, ˌsɛm aɪ- /


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.


of, for, or pertaining to a semisubmersible.

Origin of semisubmersible

First recorded in 1960–65; semi- + submersible Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for semisubmersible rig

semisubmersible rig


(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
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