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单词 proostracum
释义 pro·os·tra·cum
\prōˈästrə̇kəm\ noun
(plural proostra·ca \-kə\)
Etymology: New Latin, from pro- (I) + Greek ostrakon earthen vessel, potsherd, shell — more at oyster
: the anterior horny or calcareous prolongation of the phragmocone of belemnites and related cephalopods
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