A sequence of six tones with a semitone in the middle, the others being whole tones, that was used in medieval music.
[Medieval Latin hexachordum, from Latin hexachordos, having six strings or stops : Greek hexa-, hexa- + Greek -khordos, string, note (from khordē; see CORD).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.