Source : Webster's Revised Unabridged Dictionary (1913)

Lithodome \Lith"o*dome\ (-d[=o]m), n. [Litho- + Gr. do`mos
   house: cf. F. lithodome.] (Zo["o]l.)
   Any one of several species of bivalves, which form holes in
   limestone, in which they live; esp., any species of the genus
   {Lithodomus}.