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Forstner bit

or Foerstner bit

[fawrst-ner]
noun Carpentry.
  1. a bit for drilling blind holes, guided from the rim rather than from the center to permit it to enter the wood at an oblique angle.
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Origin of Forstner bit

First recorded in 1900–05; after Benjamin Forstner, its inventor
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018