Periostracum meaning

pĕrē-ŏstrə-kəm
The tough horny or fibrous outer covering of the shell of many mollusks and brachiopods.
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A horny covering, secreted as the outermost layer of most mollusk shells, that protects the underlying shell from erosion.
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(malacology) The proteinaceous outer sheath of many molluscan shells.
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Origin of periostracum

  • New Latin peri– Greek ostrakon shell ost- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Literally "surrounding shell," from peri- +"Ž ostracum.

    From Wiktionary