drilling rig


From The Collaborative International Dictionary of English v.0.48:

oil rig \oil" rig`\, oilrig \oil"rig`\n.
   A structure and associated machinery used in drilling for oil
   or gas; it is usually in the form of a tower. Called also
   drilling rig.

   Syn: drill rig, drilling rig, oil rig.
        [WordNet 1.5]
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