Lewis Short
(verb) : ad-murmŭro, āvi, ātum, 1
* To murmur with approbation or disapprobation (cf. acclamo): quam valde universi admurmurārint,Cic. Verr. 2, 5, 16: admurmurante senatu neque me invito,id. Att. 1, 13, 2.—Impers.: cum esset admurmuratum,Cic. de Or. 2, 70, 285.
Charlton T. Lewis, Charles Short, A Latin Dictionary