prodatary|prəʊˈdeɪtərɪ| [ad.mod.L. prōdatāri-us: see pro-1 4 and datary1.] The title given to the presiding official of the datary office at Rome, when a cardinal. 1880Libr.Univ.Knowl. (N.Y.) VIII. 808 Pope Leo [XIII] appointed..Cardinal Sacconi prodatary.