Definition of chestnut borer
: an insect that bores in the wood of the chestnut tree
specifically
: a small blue-black yellow-striped beetle (Agrilus bilineatus) having a flattened larva that bores in various deciduous trees
— called also two-lined chestnut borer
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“Chestnut borer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chestnut%20borer. Accessed 28 Feb. 2021.
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