The Collaborative International Dictionary of English v.0.48:

Abassi \A*bas"si\ ([.a]*b[a^]s"s[i^]), Abassis \A*bas"sis\
   ([.a]*b[a^]s"s[i^]s), n. [Ar. & Per. ab[=a]s[imac], belonging
   to Abas (a king of Persia).]
   A silver coin of Persia, worth about twenty cents.
   [1913 Webster]