drilling rig

from WordNet (r) 3.0 (2006)

drilling rig
    n 1: rig used in drilling for oil or gas [syn: {drill rig},
         {drilling rig}, {oilrig}, {oil 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]