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Forstner bit

American  
[fawrst-ner] / ˈfɔrst nər /
Or Foerstner bit

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.


Etymology

Origin of Forstner bit

First recorded in 1900–05; after Benjamin Forstner, its inventor