Semuncia

·noun A Roman coin equivalent to one twenty-fourth part of a Roman pound.

semuncia
sēm-uncĭa, ae, f. [semi; semuncia quod dimidia pars unciae, Varr. L. L. 5, § 171 Müll.], a half-ounc...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
semuncia
sēmūncia ae, f semi+uncia, a half-ounce, one twenty-fourth part of a pound : auri, unde anulus fie...

An Elementary Latin Dictionary