Lewis & Short

signātor, ōris, m. [signo].

  1. I. A sealer, signer.
    1. A. One who attests a will by sealing it, a witness to a will (mostly postAug.; not in Cic.): ex illis testes signatoresque falsos commodare, Sall. C. 16, 2: signator falso, a forger, Juv. 1, 67; Suet. Aug. 33; id. Tib. 23; Val. Max. 7, 7, 2; Dig. 18, 3, 8; Vulg. 2, Esd. 10, 1.
    2. B. One who affixes his seal as witness to a marriage-contract, a witness to a marriage, Juv. 10, 336.
  2. II. One who stamps money, a coiner, Inscr. Grut. 1066, 5; 1070, 1; Inscr. Orell. 3229.