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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