drill string
noun
(on a drill rig) the assemblage of drill pipes that link the drill bit to the mechanism that imparts rotary or reciprocating motion.
Origin of drill string
First recorded in 1695–1705
Words nearby drill string
drill corps,
drill down,
drill pipe,
drill press,
drill rig,
drill string,
drill team,
drill tower,
drilling,
drilling mud,
drilling platform
British Dictionary definitions for drill string
drill string
drill pipe
noun
(in the oil industry) a pipe made of lengths of steel tubing that is attached to the drilling tool and rotates during drilling to form a bore