Having a pleasant and fluid sound: "The Headmaster read a rather lengthy passage from Stephen Vincent Benet's 'The Devil and Daniel Webster' in his engaging, mellifluous voice" (John Knowles).
[Middle English, from Late Latin mellifluus : Latin mel, mell-, honey; see melit- in the Appendix of Indo-European roots + Latin -fluus, flowing; see bhleu- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.