Pronunciation: (mûr'mur),[key] —n. 1. a low, continuous sound, as of a brook, the wind, or trees, or of low, indistinct voices.
2. a mumbled or private expression of discontent.
3. Also called heart murmur.Med. a. an abnormal sound heard on listening to the heart, usually through a stethoscope, produced by the blood passing through deformed cardiac valves.
b. in some persons a similar sound heard when blood passes through normal valves.
4. Phonet.a voice quality in which vibration of the vocal cords is accompanied by the escape of a great deal of air, as in the (h) of ahead; breathy voice.
—v.i. 1. to make a low or indistinct sound, esp. continuously.
2. to speak in a low tone or indistinctly.
3. to complain in a low tone or in private.
—v.t. 1. to sound by murmurs.
2. to utter in a low tone: He murmured a threat as he left the room.