Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: French
Origin: Latin efflorescere 'to come into flower', from flos; FLORA

efflorescence

 noun
     
ef‧flo‧res‧cence [uncountable] technical
the action of flowers, art etc forming and developing, or the period of time when this happens
Definition from the Longman Dictionary of Contemporary English
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