Periostraca
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:

  • epidermis — 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

  • 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

  • Calcite sea — A calcite sea is one in which low magnesium calcite is the primary inorganic marine calcium carbonate precipitate. An aragonite sea is the alternate seawater chemistry in which aragonite and high magnesium calcite are the primary inorganic… …   Wikipedia

  • 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 — [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

  • dog cockle — noun : any of certain marine bivalve mollusks (family Glycymeridae) having substantial rounded shells with dark velvety periostraca and prominent hinge teeth, a crescentic foot, and an open mantle and living chiefly on the bottom of warm seas …   Useful english dictionary

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