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单词 periostracal
释义

WordReference Random House Unabridged Dictionary of American English © 2024
per•i•os•tra•cum  (per′ē ostrə kəm),USA pronunciation n., pl. -ca (-kə).USA pronunciation 
  1. Invertebratesthe external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
  • Greek óstrakon. See oyster
  • Neo-Latin, equivalent. to peri- peri- + ostracum a shell
  • 1830–40
per′i•ostra•cal, adj. 

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