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cyathium

noun
cy·​ath·​i·​um | \sīˈathēəm\
plural cyathia\-​ēə \

Definition of cyathium 

: an inflorescence consisting of a cuplike involucre with the flowers arising from its base (as in the poinsettia)

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History and Etymology for cyathium

New Latin, from Greek kyathion, kyatheion, diminutive of kyathos cup

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