boring bar

noun
Metalworking. a bar holding a tool for boring a cylinder or the like.

Origin:
1835–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The coolant discharges from the boring bar through a telescopic coolant tube into a cyclone, which reduces velocity.
Mud rings which form on kiln walls near the discharge end are removed periodically with a boring bar.
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