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