| 单词 | periostracum |
| 释义 | periostracum —periostracal, adj. /per'ee os"treuh keuhm/, n. , pl. periostraca /-keuh/. the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids. [1830-40; < NL, equiv. to peri- PERI- + ostracum a shell < Gk óstrakon. See OYSTER] |
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