ef·flo·resce 
(ĕf′lə-rĕs)
(ĕf′lə-rĕs)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.
3. Chemistry
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).]