verb (used without object), effloresced, efflorescing.
to burst into bloom; blossom.
to change either throughout or on the surface to a mealy or powdery substance upon exposure to air, as a crystalline substance through loss of water of crystallization.
to become incrusted or covered with crystals of salt or the like through evaporation or chemical change.

1765–75; < Latin efflōrēscere to blossom out, equivalent to ef- ef- + flōrēscere to begin to bloom (flōr(i)-, stem of flōs flower + -ēscere -esce)

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World English Dictionary
effloresce (ˌɛflɔːˈrɛs)
1.  to burst forth into or as if into flower; bloom
2.  to become powdery by loss of water or crystallization
3.  to become encrusted with powder or crystals as a result of chemical change or the evaporation of a solution
[C18: from Latin efflōrēscere to blossom, from flōrēscere, from flōs flower]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1775, from L. efflorescere, from ex "out" + florescere "to blossom," from flos (see flora).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

effloresce ef·flo·resce (ěf'lə-rěs')
v. ef·flo·resced, ef·flo·resc·ing, ef·flo·resc·es

  1. To blossom; bloom.

  2. To become a powder by losing water of crystallization, as when a hydrated crystal is exposed to air.

ef'flo·res'cence n.
The American Heritage® Stedman's Medical Dictionary
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