Lewis Short
murmŭrātĭo (noun F) : id.
* A murmuring, crying (post-Aug.): aquilarum,Plin. 10, 3, 3, § 6: deum sine murmuratione comitari,without murmuring,Sen. Ep. 107, 9; id. Ben. 5, 15, 2: servi mei, id. de Ira, 3, 24, 2.
Charlton T. Lewis, Charles Short, A Latin Dictionary