epistolium ī, n
, ἐπιστόλιον, a short letter, note: Conscriptum, Ct.
ĕpīstŏlĭum, ii, n., = ἐπιστόλιον, a short letter , note , Cat. 68, 2. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.