| 释义 |
periostracum【医】 外壳膜 periostracum per.i.os.tra.cum AHD: [pµr”¶-¼s“tr…-k…m] D.J. [7peri86Kstr*k*m]K.K. [7pWri6$str*k*m]n.（名词） 【复数】 per.i.os.tra.ca[-k…] 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语源:1. New Latin 现代拉丁语 2. peri- peri-3. Greek ostrakon [shell] * see ostracod 希腊语 ostrakon [壳] *参见 ostracod |