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cranidium

noun
cra·​nid·​i·​um | \krəˈnidēəm\
plural cranidia\ -​dēə \

Definition of cranidium 

: the central part of the cephalon of a trilobite bounded by the facial sutures

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History and Etymology for cranidium

New Latin, from Late Greek kranidion small skull, diminutive of kranion skull

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