xylophaga

from The Century Dictionary.

• noun A genus of boring bivalves, of the family Pholadidæ, as X. dorsalis.
• noun [lowercase] A member of this genus.
• noun A series of Hymenoptera ditrocha, in Hartig's classification (1837), containing only the family Uroceridæ: distinguished from the Phyllophaga on the one hand and the Parasitica on the other. Compare these two words.
• noun A group of rhynchophorous insects.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) A genus of marine bivalves which bore holes in wood. They are allied to Pholas.