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