From The Collaborative International Dictionary of English v.0.48 [gcide]:
Mellifluous \Mel*lif"lu*ous\, a. [L. mellifluus; mel, mellis,
honey (akin to Gr. ?, Goth. milip) + fluere to flow. See
Mildew, Fluent, and cf. Marmalade.]
Flowing as with honey; smooth; flowing sweetly or smoothly;
as, a mellifluous voice. -- Mel*lif"lu*ous*ly, adv.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
mellifluous
adj 1: pleasing to the ear; "the dulcet tones of the cello"
[syn: dulcet, honeyed, mellifluous, mellisonant,
sweet]