The Collaborative International Dictionary
Saxicavous
Saxicavous \Sax`i*ca"vous\, a. [L. saxum rock + cavare to make hollow, fr. cavus hollow: cf. F. saxicave.] (Zo["o]l.) Boring, or hollowing out, rocks; -- said of certain mollusks which live in holes which they burrow in rocks. See Illust. of Lithodomus.
Wiktionary
saxicavous
a. (context zoology English) bore or hollowing out rocks.