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
Novel ideas among highly skilled researchers were not the limiting reagent.
Each reagent is lined up sequentially in one long channel and separated by small air bubbles.
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