effusion

UK: /ɪˈfjuːʒən/ US: (i fyo̅o̅′zhən)

WordReference Random House Unabridged Dictionary of American English © 2025

ef•fu•sion  (i fyo̅o̅′zhən), n. 

1. the act of effusing or pouring forth.
2. something that is effused.
3. an unrestrained expression, as of feelings:
   poetic effusions.
4. Pathology
   • the escape of a fluid from its natural vessels into a body cavity.
   • the fluid that escapes.
5. Physics the flow of a gas through a small orifice at such density that the mean distance between the molecules is large compared with the diameter of the orifice.

• Latin effūsiōn- (stem of effūsiō), equivalent. to ef- ef- + fūsion- fusion
• Anglo-French)
• Middle English (1350–1400

Collins Concise English Dictionary © HarperCollins Publishers::

effusion / ɪˈfjuːʒən/ noun

1. an unrestrained outpouring in speech or words
2. the act or process of being poured out
3. something that is poured out
4. the escape of blood or other fluid into a body cavity or tissue
5. the fluid that has escaped