jack-up rig
noun
an offshore drill rig or platform having a floating hull fitted with retractable legs that can be lowered to the seabed to elevate the hull above wave level.
Compare semisubmersible.
Origin of jack-up rig
First recorded in 1965–70
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019