approbator

apprŏbātor (adp-), ōris, m. [approbo],

one who gives his assent or approval , an approver (perh. only in the two foll. exs.): quamvis non fueris suasor et impulsor profectionis meae, adprobator certe fuisti, * Cic. Att. 16, 7, 2: verbi, * Gell. 5, 21, 6.