saxicava

from The Century Dictionary.

• noun A genus of bivalve mollusks, typical of the family Saxicavidæ, whose species live mostly in the hollows of rocks which they excavate for themselves.

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

• noun (Zoöl.) Any species of marine bivalve shells of the genus Saxicava. Some of the species are noted for their power of boring holes in limestone and similar rocks.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology Any of the marine bivalve shells of the genus Saxicava.