bit the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press; "he looked around for the right size bit"
core bit a hollow drilling bit that is the cutting part of a core drill; allows core samples to be taken
drill bit -
Any other style of cutter, for example a spade drill, that is rotated and fed in a similar manner as a twist drill to of cut a hole in metal, wood or other materials.
OmegaWiki Dictionary
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drill bit A cutting tool used to create cylindrical holes.