obsignator

obsīgnātor ōris, m

obsigno, a sealer, one who attests under seal : litterarum: obsignatores adducit, witnesses (to a will).

obsignator
obsignātor, ōris, m. [obsigno], a sealer, sealer up (class.): litterarum obsignator, Cic. Clu. 66...

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