murmuration

from WordNet (r) 3.0 (2006)

murmuration
    n 1: a low continuous indistinct sound; often accompanied by
         movement of the lips without the production of articulate
         speech [syn: {mutter}, {muttering}, {murmur}, {murmuring},
         {murmuration}, {mussitation}]

from The Collaborative International Dictionary of English v.0.48

Murmuration \Mur`mur*a"tion\, n. [L. murmuratio.]
   The act of murmuring; a murmur. [Obs.] --Skelton.
   [1913 Webster]

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