1. Not accented: an atonic syllable.
2. Medicine Relating to, caused by, or exhibiting lack of muscle tone.
A word, syllable, or sound that is unaccented.
[From Greek atonos; see ATONY.]
at′o·nici·ty (ăt′ə-nĭsĭ-tē, ăt′n-ĭs-) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.