Definition of effusion noun from the Oxford Advanced Learner's Dictionary

     

    effusion

     noun
    noun
    BrE BrE//ɪˈfjuːʒn//
     
    ; NAmE NAmE//ɪˈfjuːʒn//
     
    [countable, uncountable]
     
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  1. 1(specialist) something, especially a liquid, that flows out of somebody/something; the act of flowing out
  2. 2(formal) the expression of feelings in an exaggerated way; feelings that are expressed in this way
  3. Word Origin late Middle English: from Latin effusio(n-), from effundere ‘pour out’, from ex- ‘out’ + fundere ‘pour’.
See the Oxford Advanced American Dictionary entry: effusion