Lewis Short
(adjective) = ὀξύμωρος: oxymōrus, a, um
* Acutely silly: oxymora verba, expressions which at first sight appear absurd, but which contain a concealed point; so especially of such apparently contradictory assertions as: cum tacent clamant, etc. (Cic. Cat. 1, 8, 21), Pseudo Ascon. ad Cic. Div. in Caecil. 1.
Charlton T. Lewis, Charles Short, A Latin Dictionary