pho·nol·o·gy (fə-nŏlə-jē, fō-)
n. pl. pho·nol·o·gies
1. The study of speech sounds in language or a language with reference to their distribution and patterning and to tacit rules governing pronunciation.
2. The sound system of a language: the phonology of English.
pho·no·logic (fō′nə-lŏjĭk), pho′no·logi·cal (-ĭ-kəl) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.