effusion Hear it!

effusion definition

ef·fu·sion (e fyo̵̅o̅′z̸hən, i-)

noun

  1. a pouring forth
  2. unrestrained or emotional expression in speaking or writing
    1. an escape of fluid that is bloody, serous, etc. into body cavities or tissues
    2. this fluid
  4. the passage of a gas under pressure through an orifice whose size is smaller than the mean free path of the gas molecules, as in measuring low vapor pressures

Etymology: ME & OFr < L effusio: see effuse

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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