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drill rig

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noun
  1. rig(def 7).

Origin of drill rig

An Americanism dating back to 1910–15
Also called drilling rig.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for drilling rig

drilling rig

noun
  1. the full name for rig 1 (def. 6)
  2. a mobile drilling platform used for exploratory offshore drilling
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012