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From Biology-Online Dictionary
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(1) (botany) To blossom; to bloom.

(2) (chemistry) To form salt crystals on a surface by the spontaneous loss of water (as vapor) as by simple exposure to air.

(3) (chemistry) To become covered or encrusted with deposits or salts that result from the process of efflorescing.

(5) To become a powder or crust by losing water of crystallization.


In chemistry, an example of efflorescence is when a gypsum is exposed to a dry environment it will lose its water by evaporation and form a solid crust, anhydrite, on the surface.

Word origin: Latin efflorescere (to bloom, blossom).
Related forms: efflorescent (adjective), efflorescence (noun)