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Entry 1 sense Webster, 1913

oil rig

· oil· rig · IPA
01 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.
  1. 1.
    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. Also: drilling rig
Syn. drill rig, drilling rig, oil rig.