- 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.
Examples from the Web for borer
It is the nature of the borer to maim or kill the tree; it is for the interest of the owner that the tree should live.The Fat of the Land|John Williams Streeter
This borer would come close to meeting the professor's, four miles under our camp!Astounding Stories, April, 1931|Various
The borer seems more destructive in those sections which are comparatively sheltered, the starfish in more exposed localities.A Report upon the Mollusk Fisheries of Massachusetts|Commissioners on Fisheries and Game
By this means the borer E can be moved within certain limits, so as to bore holes in different positions.
The method of using the borer, has been described under Artesian Wells.