Definition of rock borer in English:

rock borer

Line breaks: rock borer

Entry from British & World English dictionary

noun

Any of a number of burrowing bivalve molluscs which bore into rock and other hard materials, in particular:
  • a mussel with a cigar shaped shell, occurring in warm seas (genus Lithophaga, family Mytilidae).a clam with an oval to oblong shell (genus Hiatella, family Hiatellidae).

Definition of rock borer in:

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Word of the day setose
Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly