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tremissis

noun
tre·​mis·​sis | \trə̇ˈmisə̇s\
plural tremisses\ -​ˈmiˌsēz \

Definition of tremissis 

: a Byzantine triens or a similar gold coin of early western Europe

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History and Etymology for tremissis

Late Latin tremis, tremissis, from Latin tres three + -mis, -missis (as in semis, semissis)

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