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Definition of efflorescence noun from the Oxford Advanced American Dictionary

     

    efflorescence

     noun
    noun
    NAmE//ˌɛfləˈrɛsns//
     
    [uncountable, countable]
     
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  1. 1(formal) the most developed stage of something
  2. 2(chemistry) the powder which appears on the surface of bricks, rocks, etc. when water evaporates
See efflorescence in the Oxford Advanced Learner's Dictionary
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