actŭārĭŏlum: i, n. dim. actuarius,I a small, swift vessel impelled by oars, row-boat, barge, Cic. Att. 10, 11, 4; 16, 3, 6; 16, 6, 1.
actuariolum actuarioli N N :: small fast vessel (impelled by oars); row boat; barge