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periostracum
[ per-ee-os-truh-kuhm ]
noun
, plural per·i·os·tra·ca [per-ee-, os, -tr, uh, -k, uh].
- the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
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Other Words From
- peri·ostra·cal adjective
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Word History and Origins
Origin of periostracum1
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Example Sentences
Gray calls it the Periostracum, from the membranous skin covering the bones of quadrupeds.
From Project Gutenberg
The periostracum, or epidermis, is heavy and often velvety or even hairy.
From Project Gutenberg
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