Definition of rock borer in English:

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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).
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