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epithema

noun
ep·​i·​the·​ma | \ˌepəˈthēmə, ə̇ˈpithəmə\
plural epithemata\-​thēmətə, -​them-​ \

Definition of epithema 

: a horny excrescence on the bill of some birds (such as the casque of a hornbill)

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History and Etymology for epithema

New Latin, from Greek epithema something put on, from epitithenai

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