[bawr-er, bohr-]
a person or thing that bores or pierces.
Machinery. a tool used for boring; auger.
any of several insects that bore into trees, fruits, etc., especially a beetle that bores into the woody part of plants.
any of various mollusks, worms, etc., that bore into wood, stone, coral, or shells.
a marsipobranch fish, as a hagfish, that bores into other fishes to feed on their flesh.

1275–1325; Middle English; see bore1, -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
borer (ˈbɔːrə)
1.  a machine or hand tool for boring holes
2.  woodborer corn borer marine borer See also rock borer any of various insects, insect larvae, molluscs, or crustaceans that bore into rock or plant material, esp wood

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The damage caused by the coffee berry borer is commonly put at half a billion dollars a year.
For years coffee farmers the world over have been battling the destructive coffee berry borer with insecticides.
Consider, for example, the beetle known as the sugarcane rootstalk borer weevil.
To protect forests from the emerald ash borer, firewood cannot be brought into campgrounds in the area.
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