reagent

[ree-ey-juh nt] /riˈeɪ dʒənt/
noun, Chemistry
1.
a substance that, because of the reactions it causes, is used in analysis and synthesis.
Origin
1790-1800; re(act) + agent; cf. act
Examples from the web for reagent
  • 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.
British Dictionary definitions for reagent

reagent

/riːˈeɪdʒənt/
noun
1.
a substance for use in a chemical reaction, esp for use in chemical synthesis and analysis
Word Origin and History for reagent
n.

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

reagent in Medicine

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

reagent in Science
reagent
  (rē-ā'jənt)   
A substance participating in a chemical reaction, especially one used to detect, measure, or produce another substance. Compare agent.