Borer

1. n. The hagfish (Myxine).
2. n. One that bores; an instrument for boring.
3. n. A marine, bivalve mollusk, of the genus Teredo and allies, which burrows in wood. See Teredo.
4. n. Any bivalve mollusk (Saxicava, Lithodomus, etc.) which bores into limestone and similar substances.
5. n. One of the larvae of many species of insects, which penetrate trees, as the apple, peach, pine, etc. See Apple borer, under Apple.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.