Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
murmur [ˈməːmər] n (of voices, waves) ро́пот; (of wind) ше́лест
vti шепта́ть*(impf)
heart murmur шумы́ mpl в се́рдце
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: