or·tho·e·py (ôr-thōə-pē, ôrthō-ĕp′ē)
a. The study of the pronunciation of words.
b. The study of the relationship between the pronunciation of words and their orthography.
2. The customary pronunciation of words.
[Greek orthoepeia, correctness of diction : ortho-, ortho- + epos, epe-, word; see wekw- in the Appendix of Indo-European roots.]
or′tho·epic (-ĕpĭk), or′tho·epi·cal (-ĕpĭ-kəl) adj.
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.