intr.v. throbbed, throb·bing, throbs
1. To beat rapidly or violently, as the heart; pound.
2. To feel or be subjected to a pulsating pain: My toe was throbbing after I stubbed it.
3. To vibrate, pulsate, or sound with a steady pronounced rhythm: boat engines throbbing.
A beating, pulsating, or vibration.
[Middle English throbben, of imitative origin.]
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.