the act or process of transfusing.
Medicine/Medical. the direct transferring of blood, plasma, or the like into a blood vessel.

1570–80; < Latin trānsfūsiōn- (stem of trānsfūsiō) decanting, intermingling, equivalent to trānsfūs(us) (see transfuse) + -iōn- -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
transfusion (trænsˈfjuːʒən)
1.  the act or an instance of transfusing
2.  the injection of blood, blood plasma, etc, into the blood vessels of a patient

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

transfusion trans·fu·sion (trāns-fyōō'zhən)

  1. The transfer of whole blood or blood products from one individual to another.

  2. The intravascular injection of physiological saline solution.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
transfusion   (trāns-fy'zhən)  Pronunciation Key 
The transfer of blood or a component of blood, such as red blood cells, plasma, or platelets, from one person to another to replace losses caused by injury, surgery, or disease. Donated blood products are tested for blood type and certain infectious diseases and stored in blood banks until they are used. The blood of the donor is shown to be histologically compatible, or crossmatched, with that of the recipient before transfusion. See more at Rh factor. See Note at blood type.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
But doctors could not immediately give her a transfusion because she had signed
  a form refusing it on religious grounds.
Testing showed that he had received an illegal blood transfusion.
If the donor and patient aren't genetically similar enough, the patient's body
  will reject the transfusion.
The other half will get a routine treatment of transfusion with saline solution
  until they reach the hospital.
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