单词	periostracum
释义	periostracum noun peri·​os·​tra·​cum ˌperēˈästrəkəm plural periostraca -kə : a chitinous layer covering the exterior of the shell in many mollusks, being usually well developed in freshwater forms, and serving to protect the shell from corrosion Word History Etymology New Latin, from peri- + Greek ostrakon shell
随便看	spurners spurning spurnings spurns spurnwater spurred spurred butterfly pea spurred gentian spurrers spurrey spurreys spurrier spurriers spurries spurring spurrings spurrite spurry spurs spurt spurted spurters spurting spurtive spurtle

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