WordReference Random House Unabridged Dictionary of American English © 2020
Forstner bit′  (fôrstnər),USA pronunciation [Carpentry.]
  1. Buildinga 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.
Also,  Foerstner bit. 
  • after Benjamin Forstner, its inventor 1900–05

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