Definitions of borer
  1. noun
    a drill for penetrating rock
    synonyms: bore bit, rock drill, stone drill
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    cross bit
    a rock drill having cruciform cutting edges; used in mining
    star drill
    a steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows
    straight flute, straight-fluted drill
    a rock drill with flutes that are straight
    type of:
    a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)
  2. noun
    any of various insects or larvae or mollusks that bore into wood
    synonyms: woodborer
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    type of:
    any animal lacking a backbone or notochord; the term is not used as a scientific classification
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