murmuration
mur·mu·ra·tion
noun
1.
a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
Origin
1350-1400; Medieval Latin murmuratio (“murmuring, grumbling”), equivalent to murmur + -ation. The “flock of starlings” sense is probably derived from the sound of the very large groups that starlings form at dusk.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.