Definition of pear borer
1 : the larva of a small clearwing moth (Thamnosphecia pyri) that is similar to the peach-tree borer but smaller and that bores beneath the bark of the pear
2 : the larva of a beetle (Chrysobothris femorata) of the family Buprestidae that attacks apple, pear, oak, and maple trees
3 : the larva of a related European beetle (Agrilus sinuatus) that bores under the bark making zigzag galleries
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