Reagents

[ree-ey-juhnt]

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; compare act
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Reagents is always a great word to know.
So is quincunx. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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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