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 per·i·os·tra·cum P0195350 (pĕr′ē-ŏs′trə-kəm)n. pl. per·i·os·tra·ca (-kə) The tough horny or fibrous outer covering of the shell of many mollusks and brachiopods. [New Latin : peri- + Greek ostrakon, shell; see ost- in Indo-European roots.] periostracum (ˌpɛrɪˈɒstrəkəm) n (Zoology) zoology the thin outer organic covering of a mollusc shell periostracum periostracum [‚per·ē′äs·trə·kəm] (invertebrate zoology) A protective layer of chitin covering the outer portion of the shell in many mollusks, especially fresh-water forms. periostracum periostracum the outermost of the three layers of the shell of molluscs or brachiopods, composed of CONCHIOLIN. On the inner side lie the prismatic layer and the nacreous layer.
随便看	in-space technology experiments program in spades inspan in span interconnect inspanned inspanning inspans in spare time inspass in spate inspe inspear inspec inspecciones globales inspecciòn ocular inspección general de cooperativas inspección general de justicia inspección técnica de vehículos in special in specie inspect inspectable inspect and repair as required inspect and repair only as necessary inspect and repair only as needed

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periostracum