Source : Webster's Revised Unabridged Dictionary (1913)

Byzant \Byz"ant\, Byzantine \Byz"an*tine\ (-[a^]n"t[imac]n)
   n.[OE. besant, besaunt, F. besant, fr. LL. Byzantius,
   Byzantinus, fr. Byzantium.] (Numis.)
   A gold coin, so called from being coined at Byzantium. {See
   Bezant}.

Source : WordNet®

byzant
     n : a gold coin of the Byzantine Empire; widely circulated in
         Europe in the Middle Ages [syn: {bezant}, {bezzant}, {solidus}]