verb (used without object), ef·flo·resced, ef·flo·resc·ing.

  1. to burst into bloom; blossom.
  2. Chemistry.
    1. 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.
    2. to become incrusted or covered with crystals of salt or the like through evaporation or chemical change.

verb (intr)

  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

“to come into flower,” 1775, from Latin efflorescere “to blossom, spring up, flourish, abound,” from ex “out” (see ex-) + florescere “to blossom,” from flos (see flora).


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

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