英语词汇“periostracum”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	periostracum
释义	‖ periostracum Zool.\|pɛrɪˈɒstrəkəm\| [mod.L., f. Gr. περί around + ὄστρακον shell of a mussel, etc.] The outer horny covering of the shell of a mollusc or brachiopod. Hence periˈostracal a., pertaining to the periostracum. 1840Penny Cycl. XVII. 452/1. 1841 Ibid. XXI. 373/1 The external coat or layer, Epidermis and Periostracum of authors, is of a somewhat horny or membranaceous character.1870Nicholson Man. Zool. 230 All living shells have an outer layer of animal matter, which is known as the ‘epidermis’, or ‘periostracum’.
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