noun Chemistry.
a substance that, because of the reactions it causes, is used in analysis and synthesis.

1790–1800; re(act) + agent; cf. act Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reagent (riːˈeɪdʒənt)
a substance for use in a chemical reaction, esp for use in chemical synthesis and analysis

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1797, from re- (q.v.) + agent "substance that produces a chemical reaction" (see agent).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

reagent re·a·gent (rē-ā'jənt)
A substance used in a chemical reaction to detect, measure, examine, or produce other substances.

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
reagent   (rē-ā'jənt)  Pronunciation Key 
A substance participating in a chemical reaction, especially one used to detect, measure, or produce another substance. Compare agent.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Prepared lab reagents, answered questions during lab sessions, graded papers
  and quizzes.
It contains granular pigment, and stains deeply with ordinary reagents.
The cell can continue to discharge until either or both of the electrodes run
  out of reagents for their respective reactions.
In this science you can't breed more rats or order more reagents.
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