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passive transport

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passive transport  
n.  The movement of a chemical substance across a cell membrane without expenditure of energy by the cell, as in diffusion.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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passive transport

noun
transport of a substance across a cell membrane by diffusion; expenditure of energy is not required 
WordNet® 3.0, © 2006 by Princeton University.
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