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semi·sub·mers·ible | \ ˌse-mē-səb-ˈmər-sə-bəl 
, ˌse-ˌmī-, -mi- \
, ˌse-ˌmī-, -mi- \Definition of semisubmersible
: being a floating deepwater drilling platform that is towed to a desired location and then partially flooded for stabilization and usually anchored
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Time Traveler for semisubmersible
The first known use of semisubmersible was in 1962
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