Definition of wood borer
1 : a grub that is the wood-boring larva of any of numerous beetles (as a click beetle, longicorn beetle, buprestid, or weevil) — compare apple tree borer
2 : a borer (as the peach tree borer) that is the larva of any of various lepidopterous insects and especially of a clearwing moth or a goat moth
3 : a borer that is the larva of a horntail (family Siricidae)
4 : any of several bivalve mollusks (as the teredos and members of the genus Xylophaga) that bore in wood
5 : any of several small crustaceans (as the gribble) that bore in wood
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