Lewis Short
calcŭlātor (noun M) : calculo
* A computer, teacher of arithmetic, = λογιστής (post-Aug.), Mart. 10, 62, 4; Acron. ad Hor. S. 1, 6. 72; Isid. Orig. 1, 3, 1; cf. id. ib. 1, 10, 43.
* A book-keeper, accountant, Dig. 38, 1, 7, § 5; 27, 1, 15, § 5.
Charlton T. Lewis, Charles Short, A Latin Dictionary