compromissarius

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

comprōmissārĭus, a, um, adj. [compromissum],

pertaining to arbitration : judex, an arbitrator, umpire, referee chosen by contending parties (jurid. Lat.), Dig. 4, 8, 41; 26, 5, 4.