re-agent

re·a·gent

[ree-ey-juhnt]
noun Chemistry.
a substance that, because of the reactions it causes, is used in analysis and synthesis.

Origin:
1790–1800; re(act) + agent; cf. act

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
reagent (riːˈeɪdʒənt) [Click for IPA pronunciation guide]
 
n
a substance for use in a chemical reaction, esp for use in chemical synthesis and analysis

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Re-agent is always a great word to know.
So is lollapalooza. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

reagent
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)
n.
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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