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rotary drill

   Also found in: Wikipedia 0.01 sec.
rotary drill [′rōd·ə·rē ′dril]
(mechanical engineering)
Any of various drill machines that rotate a rigid, tubular string of rods to which is attached a rock cutting bit, such as an oil well drilling apparatus.
rotary drill
A machine for opening holes in rock or earth by means of a cutting bit at the end of a metal shank; usually turned by a hydraulically or pneumatically driven motor.
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