| Borer 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). Thesaurus Entries aculeus, acumination, bit, bore, bore bit, borer, brace and bit, breast auger, breast drill, broach, burr, chamfer bit, corkscrew, cross bit, cusp, diamond drill, drill, drill press, gimlet, hand drill, keyway drill, mucro, neb, needle, nib, point, portable drill, posthole auger, power drill, prick, prickle, pump drill, ratchet drill, reamer, rotary drill, star drill, sting, strap drill, tap, tip, trepan, trephine, twist bit, twist drill, wimble |