Lithophagous
Lithophagous , adjective
[Litho- + Greek {not transcribed} to eat.]
(a)
(Zoology) Eating or swallowing stones or gravel, as the ostrich.
(b)
(Zoology) 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.