mur·mur (mûr?m?r)n.1. A low, indistinct, continuous sound: spoke in a murmur; the murmur of the waves.2. An indistinct, whispered, or confidential complaint; a mutter.3. Medicine An abnormal sound, usually emanating from the heart, that sometimes indicates a diseased condition.v. mur·mured, mur·mur·ing, mur·murs v.intr.1. To make a low, continuous, indistinct sound or succession of sounds.2. To complain in low mumbling tones; grumble.v.tr. To say in a low indistinct voice; utter indistinctly: murmured his approval.[Middle English murmure, from Old French, from Latin murmur, a humming, roaring, of imitative origin.]mur?mur·er n.mur?mur·ing·ly adv.mur?mur·ous adj.mur?mur·ous·ly adv.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.murmur (?m??m?) n1. a continuous low indistinct sound, as of distant voices2. an indistinct utterance: a murmur of satisfaction. 3. a complaint; grumble: he made no murmur at my suggestion. 4. (Medicine) med any abnormal soft blowing sound heard within the body, usually over the chest. See also heart murmurvb, -murs, -muring or -mured5. to utter (something) in a murmur6. (intr) to complain in a murmur[C14: as n, from Latin murmur; vb via Old French murmurer from Latin murmur?re to rumble] ?murmurer n ?murmuring n, adj ?murmuringly adv ?murmurous adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014mur?mur (?m?r m?r) n. 1. a low and indistinct continuous sound, as of a brook or the wind, or of distant voices. 2. a mumbled or private expression of discontent. 3. an abnormal continuous or periodic sound heard within the body by auscultation, esp. one originating in the heart valves. v.i. 4. to make a low and indistinct continuous sound. 5. to complain in a low tone or in private. v.t. 6. to express in murmurs. [1275?1325; Middle English