adamantine drill
noun
: a tubular well-drilling bit with hardened steel shot that revolve under the rim of the rotating tube
Word History
First Known Use
circa 1904, in the meaning defined above
| 单词 | adamantine drill |
| 释义 | adamantine drillnoun : a tubular well-drilling bit with hardened steel shot that revolve under the rim of the rotating tube Word HistoryFirst Known Use circa 1904, in the meaning defined above |
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