n. pl. ter·mi·nol·o·gies
1. The vocabulary of technical terms used in a particular field, subject, science, or art; nomenclature.
2. The study of nomenclature.
[German Terminologie, from Medieval Latin terminus, expression; see TERM.]
ter′mi·no·logi·cal (-nə-lŏjĭ-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.