mussitation

mus=si=ta=tion

WORDNET DICTIONARY

mussitation(n = noun.event) murmur, murmuration, murmuring, mutter, muttering - a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech;

is a kind of sound

Derived form verb mussitate₁

mussitation, n. [L. mussitatio suppression of the voice, fr. mussitare to be silent, to murmur.].

A speaking in a low tone; mumbling. [1913 Webster]