英语词汇“periostracum”是什么意思，“periostracum”的读音、用法及例句翻译-烛光网

词汇	periostracum
释义	per·i·os·tra·cum AHD[pĕr'ē-ŏsʹtrə-kəm] D.J.[ˌperiːˈɒstrəkəm]K.K.[ˌpɛriˈɑstrəkəm]n.（名词）【复数】 per.i.os.tra.ca[-kə] The hard chitinous outer covering of the shell of many mollusks, especially freshwater ones, that protects the shell from the erosive action of water.角质层：许多软体动物，尤指淡水软体动物身体硬壳外包的一层物质，用以防止壳受水的侵蚀作用 Etymology语源 New Latin 新拉丁语 peri- peri- Greek ostrakon [shell] * see ostracod 希腊语 ostrakon [壳] * 参见 ostracod
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