A low continuous indistinct sound

• Often accompanied by movement of the lips without the production of articulate speech
• Greek character engaged in lifting drink supply leads to sotto voce comments

Wiktionary Word definitions in Wiktionary
n. 1 An act or instance of murmuring. 2 A flock of starlings.

WordNet Word definitions in WordNet
n. a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech [syn: mutter , muttering , murmur , murmuring , mussitation ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Murmuration \Mur`mur*a"tion\, n. [L. murmuratio.] The act of murmuring; a murmur. [Obs.] --Skelton.