periostracum
/per-ee-os-truh-kuhm/US // ˌpɛr iˈɒs trə kəm //
周缘,骨盆周围,骨盆周边,骨膜周围
Definitions
n.名词 noun
- 1
plural per·i·os·tra·ca [per-ee-os-truh-kuh]. /ˌpɛr iˈɒs trə kə/.
- : the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
Examples
Gray calls it the Periostracum, from the membranous skin covering the bones of quadrupeds.
The periostracum, or epidermis, is heavy and often velvety or even hairy.
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