drill bit
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for drill bit
Historical Examples of drill bit
In the Leyner drill the drill-bit is not connected to the piston, but is struck a quick succession of blows by the latter.
The bottom of the hole is kept clean and the drill-bit cooled by a stream of water passing down through its hollow shank.