Definition of periostracum in English:

periostracum

noun ˌpɛrɪˈɒstrəkəm

Zoology

The outer horny or fibrous organic covering of the shell of a mollusc or brachiopod.

Origin

Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin periostracum from peri- + ancient Greek ὄστρακον.

Definition of periostracum in US English:

periostracum

nounˌpɛrɪˈɒstrəkəm

Zoology

The outer horny or fibrous organic covering of the shell of a mollusc or brachiopod.

Origin

Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin periostracum from peri- + ancient Greek ὄστρακον.

词汇	periostracum
释义	Definition of periostracum in English: periostracum noun ˌpɛrɪˈɒstrəkəm Zoology The outer horny or fibrous organic covering of the shell of a mollusc or brachiopod. Origin Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin periostracum from peri- + ancient Greek ὄστρακον. Definition of periostracum in US English: periostracum nounˌpɛrɪˈɒstrəkəm Zoology The outer horny or fibrous organic covering of the shell of a mollusc or brachiopod. Origin Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin periostracum from peri- + ancient Greek ὄστρακον.
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