1. A shaking or vibrating movement, as of the earth.
2. An involuntary trembling or quivering, as of the hands.
3. A state or feeling of nervousness, worry, or excitement: The news sent tremors through the stock market.
4. A tremulous sound; a quaver: a tremor in her voice.
[Middle English, terror, from Old French, from Latin, a trembling, from tremere, to tremble.]
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.