\Li*thoph"a*gous\, a. [Litho- + Gr. ? to eat.]
(Zo["o]l.)
(a) Eating or swallowing stones or gravel, as the ostrich.
(b) Eating or destroying stone; -- applied to various animals
    which make burrows in stone, as many bivalve mollusks,
    certain sponges, annelids, and sea urchins. See
    {Lithodomus}.