[ in-fyoo-zhuh n ]
/ ɪnˈfyu ʒən /


the act or process of infusing.
something that is infused.
a liquid extract, as tea, prepared by steeping or soaking.
  1. the steeping or soaking of a crude drug in water.
  2. the liquid so prepared.
  1. the introduction of a saline or other solution into a vein.
  2. the solution used.


Nearby words

  1. infuriating,
  2. infuscate,
  3. infuse,
  4. infuser,
  5. infusible,
  6. infusion-aspiration drainage,
  7. infusionism,
  8. infusive,
  9. infusoria,
  10. infusorial

Origin of infusion

1400–50; late Middle English < Latin infūsiōn- (stem of infūsiō). See infuse, -ion

Related formsre·in·fu·sion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for infusion

British Dictionary definitions for infusion


/ (ɪnˈfjuːʒən) /


the act of infusing
something infused
an extract obtained by soaking
med introduction of a liquid, such as a saline solution, into a vein or the subcutaneous tissues of the body
Derived Formsinfusive (ɪnˈfjuːsɪv), adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for infusion



c.1400, from Old French infusion (13c.) or directly from Latin infusionem (nominative infusio), noun of action from past participle stem of infundere (see infuse).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for infusion


[ ĭn-fyōōzhən ]


The process of steeping a substance in water to extract its soluble principles.
A medicinal preparation from such a process.
Introduction of a solution into the body through a vein for therapeutic purposes.
The solution introduced in such a manner.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.