Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: French
Origin: Latin effundere 'to pour out'

effusion

 noun
     
ef‧fu‧sion [uncountable and countable]
1 technical a liquid or gas that flows out of something, or the act of flowing out:
a massive effusion of poisonous gas
2 formal an uncontrolled expression of strong good feelings:
He greeted the guests with effusion.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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