intr.v. ef·flo·resced, ef·flo·resc·ing, ef·flo·resc·es
1. To blossom; bloom.
2. To develop or flourish: when the arts effloresced.
a. To become a powder by losing water of crystallization, as when a hydrated crystal is exposed to air.
b. To become covered with a powdery deposit.
[Latin efflōrēscere : ex-, ex- + flōrēscere, inchoative of flōrēre, to blossom (from flōs, flōr-, flower; see bhel-3 in the Appendix of Indo-European roots).]
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.