Definition of Murmur

Noun

• a complaint uttered in a low and indistinct tone
  grumble grumbling murmuring mutter muttering
• an abnormal sound of the heart
  sometimes a sign of abnormal function of the heart valves
  - heart murmur - cardiac murmur
• a schwa that is incidental to the pronunciation of a consonant
  - murmur vowel
• a low continuous indistinct sound
  often accompanied by movement of the lips without the production of articulate speech
  mutter muttering murmuring murmuration mussitation

Verb

• make complaining remarks or noises under one's breath
  "she grumbles when she feels overworked"
  mutter grumble croak gnarl
• speak softly or indistinctly
  "She murmured softly to the baby in her arms"
  

• Scrabble® score of the murmur (10)
• Word Chums® score of the murmur (16)
• Words With Friends® score of the murmur (14)