[ree-ey-juh nt]

noun Chemistry.

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

Origin of reagent

1790–1800; re(act) + agent; cf. act Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for reagent

indicator, reagent

Examples from the Web for reagent

Historical Examples of reagent

British Dictionary definitions for reagent



a substance for use in a chemical reaction, esp for use in chemical synthesis and analysis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for reagent

1785, from re- + agent "substance that produces a chemical reaction."

Online Etymology Dictionary, © 2010 Douglas Harper

reagent in Medicine




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.

reagent in Science



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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.