Borer may refer to:
Insects
- Common furniture beetle, also known as the common house borer
- Shoot borer
- Stem borer
- Twig borer
Moths
- Chilo (moth)
- Diatraea grandiosella, southwestern corn borer
- Podosesia syringae, ash borer or lilac borer
- Melittia cucurbitae, squash vine borer, a pest of cucurbit vines
- Ostrinia, pests of maize and other plants
Beetles
- Cosmopolites sordidus (banana stemborer), a true weevil in genus Cosmopolites
- Ptinidae, a family of beetles, especially:
- Anobium punctatum, common furniture borer
- Woodboring beetles
Devices
- Cork borer, a tool of the chemistry laboratory
- Raise borer, a mining machine
- Instep borer, an instrument of torture
- Tunnel boring machine
- Reamer, a rotary cutting tool used in metalworking
- Drill
Other
- Hotheaded Naked Ice Borer, a fictional mammal
- Borer Lake, United States
- בורר ("borer"), Sorting/Purification, one of the activities prohibited in Jewish law on Shabbat
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