Periostracum
Periostracum Per`i*os"tra*cum, n.; pl. {Periostraca}. [NL., fr. Gr. ? around + ? shell of a testacean.] (Zo["o]l.) A chitinous membrane covering the exterior of many shells; -- called also {epidermis}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • periostracum — PERIOSTRÁCUM s.n. Epidermă a cochiliilor moluştelor. [< fr. périostracum, cf. gr. periostrakon < peri – în jur, ostrakon – cochilie]. Trimis de LauraGellner, 20.07.2005. Sursa: DN …   Dicționar Român

  • Periostracum — Periostracum, die oberste Schicht der Muschelschale, s. Muscheln, S. 295 …   Meyers Großes Konversations-Lexikon

  • periostracum — [per΄ē äs′trə kəm] n. pl. periostraca [per΄ē äs′trəkə] [ModL < Gr peri , around (see PERI ) + ostrakon, a shell: see OSTRACIZE] a horny covering, secreted as the outermost layer of most mollusk shells, that protects the underlying shell from… …   English World dictionary

  • Périostracum — Le périostracum est la fine enveloppe qui constitue la partie la plus externe de la coquille des mollusques et des brachiopodes, entre autres. On le trouve aussi bien chez des espèces terrestres, marines ou dulçaquicoles. Le périostracum fait… …   Wikipédia en Français

  • Periostracum — Als Periostracum bezeichnet man eine äußere, organische Schicht an der Schale bei Mollusken (Weichtieren) und Brachiopoden (Armfüßer). Dieses besteht aus Conchiolin, einem durch Chinone gegerbten und sklerotisierten Proteingemisch. Auf das… …   Deutsch Wikipedia

  • Periostracum — The periostracum is a thin organic coating or skin which is the outermost layer of the shell of many mollusks, for example the shells of many bivalves or gastropods. The periostracum is composed of a type of conchiolin (largely quinone tanned… …   Wikipedia

  • periostracum — n. [Gr. peri, around; ostrakon, shell] A thin skin or horny covering on the exterior of the shells of most Mollusca and Brachiopoda; periostracal adj …   Dictionary of invertebrate zoology

  • 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… …   Universalium

  • periostracum — noun The proteinaceous outer sheath of many molluscan shells …   Wiktionary

  • Periostracum — Peri|ọstracum   [zu griechisch óstrakon »Schale«] das, s/...ca, hornartige, dünne, aus Conchin bestehende, über der Prismenschicht (Ostracum) liegende Schutzschicht der Schalen und Gehäuse von wasserlebenden Weichtieren …   Universal-Lexikon

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