intr.v. ef·fer·vesced, ef·fer·vesc·ing, ef·fer·vesc·es
1. To emit small bubbles of gas, as a carbonated or fermenting liquid.
2. To escape from a liquid as bubbles; bubble up.
3. To show high spirits or animation.
[Latin effervēscere : ex-, up, out; see EX- + fervēscere, to start boiling, inchoative of fervēre, to boil; see bhreu- in the Appendix of Indo-European roots.]
ef′fer·vescence, ef′fer·vescen·cy n.
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.