Hypertext Webster Gateway: "Lithodomus"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Lithodomus \Li*thod"o*mus\, n. [NL. See {Lithodome}.] (Zo["o]l.)
A genus of elongated bivalve shells, allied to the mussels,
and remarkable for their ability to bore holes for shelter,
in solid limestone, shells, etc. Called also {Lithophagus}.
Note: These holes are at first very small and shallow, but
are enlarged with the growth of the shell, sometimes
becoming two or three inches deep and nearly an inch
diameter.
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