up·well·ing (ŭp-wĕlĭng, ŭpwĕl′-)
1. The act or an instance of rising up from or as if from a lower source: an upwelling of emotion.
2. A process in which cold, often nutrient-rich waters from the ocean depths rise to the surface.
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.