Source : Webster's Revised Unabridged Dictionary (1913)

Teredo \Te*re"do\, n.; pl. E. {Teredos}, L. {Teredines}. [L., a
   worm that gnaws wood, clothes, etc.; akin to Gr. ?, L. terere
   to rub.] (Zo["o]l.)
   A genus of long, slender, wormlike bivalve mollusks which
   bore into submerged wood, such as the piles of wharves,
   bottoms of ships, etc.; -- called also {shipworm}. See
   {Shipworm}. See Illust. in App.