effusion

noun ef·fu·sion \ i-ˈfyü-zhən , e- \
Updated on: 11 Sep 2017

Definition of effusion

1 :an act of effusing
2 :unrestrained expression of words or feelings
  • greeted her with great effusion
  • —Olive H. Prouty
3 a (1) :the escape of a fluid from anatomical vessels by rupture or exudation
(2) :the flow of a gas through an aperture whose diameter is small as compared with the distance between the molecules of the gas
b :the fluid that escapes

Examples of effusion in a Sentence

  1. Her poetic effusions became tiresome.

Recent Examples of effusion from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'effusion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of effusion

Middle English effusioun "emission, shedding," borrowed from Anglo-French effusiun, borrowed from Latin effūsiōn-, effūsiō, from effud-, variant stem of effundere "to pour out, discharge, expend" + -tiōn-, -tiō, suffix of action nouns — more at 1effuse


EFFUSION Defined for English Language Learners

effusion

noun

Definition of effusion for English Language Learners

  • : something that is said or expressed too much or with a lot of emotion

  • : a flow of liquid or gas


Medical Dictionary

effusion

noun ef·fu·sion \ i-ˈfyü-zhən, e- \

medical Definition of effusion

1 a :the escape of a fluid from anatomical vessels by rupture or exudation
b :the flow of a gas through an aperture whose diameter is small as compared with the distance between the molecules of the gas
2 :the fluid that escapes by extravasation — see pleural effusion


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