Meaning of semisubmersible

sem•i•sub•mers•i•ble

Pronunciation: (sem"ē-sub-mûr'su-bul, sem"ī-), [key]
— n.
  1. Also calleda 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.
—adj.
  1. of, for, or pertaining to a semisubmersible.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.