repromissor

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

rĕprōmissŏr, ōris, m. [repromitto],

one who answers or promises in return; a surety , bail , Vulg. Ecclus. 29, 21 sq.: vitae aeternae, Ambros. Fid. 4, 11, 154.