extender

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extender

 [ek-sten´der]
something that enlarges or prolongs; called also expander.
artificial plasma extender (plasma volume extender) a substance that can be transfused to maintain fluid volume of the blood in event of great necessity, supplemental to the use of whole blood and plasma. Called also plasma volume expander.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ex·ten·der

(eks-tend'ĕr)
1. A person who or device that spreads, stretches, or increases.
2. Substance that prolongs a medication's effect.
[L. extendo, to stretch]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012