reagent

noun
re·​agent | \ rē-ˈā-jənt How to pronounce reagent (audio) \

Definition of reagent

: a substance used (as in detecting or measuring a component, in preparing a product, or in developing photographs) because of its chemical or biological activity

Examples of reagent in a Sentence

Recent Examples on the Web Santamour also advocated for use of more advanced reagent kits used to test for substances other than fentanyl. Lev Facher, STAT, 11 Sep. 2022 From start to finish, Melvani’s variation of two-ingredient spinach pasta is so speedy that the limiting reagent is literally waiting for a pot of water to come to a boil. Ella Quittner, Bon Appétit, 17 Aug. 2022 Bonham had been the crucial reagent; as had been the case with Keith Moon’s spiralling alcoholism, the increasing unreliability of the drummer closely tracked the decline of the band. James Wood, The New Yorker, 24 Jan. 2022 In the case of salt, for example — probably the most important for runners — the process uses a reagent that reacts with its chloride to turn it purple. Richard A. Lovett, Outside Online, 11 Dec. 2020 If too little or too much diluent, or reagent, is used, even that can deliver a false negative or positive result. Megan Cerullo, CBS News, 4 Jan. 2022 With the popular BinaxNow test, for example, you’re supposed to swab each of your nostrils for 15 seconds and rotate the swab three times after placing it in the reagent. Jon Healey, Los Angeles Times, 16 Nov. 2021 With molecular tests, the swab is inserted into a small container, where the sample is mixed with a reagent, a substance that starts the process of revealing the sample’s genetic makeup. Jon Healey, Los Angeles Times, 16 Nov. 2021 Cheng’s team, for example, used a commercially available phospholipid reagent to slip a peptide known to home to heart cells into exosome membranes. Amanda B. Keener, Scientific American, 17 June 2020 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'reagent.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of reagent

1797, in the meaning defined above

History and Etymology for reagent

New Latin reagent-, reagens, present participle of reagere to react — more at react

Learn More About reagent

Time Traveler for reagent

Time Traveler

The first known use of reagent was in 1797

See more words from the same year

Dictionary Entries Near reagent

reagency

reagent

reaggregate

See More Nearby Entries 

Statistics for reagent

Last Updated

30 Sep 2022

Cite this Entry

“Reagent.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/reagent. Accessed 4 Oct. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for reagent

reagent

noun
re·​agent | \ rē-ˈā-jənt How to pronounce reagent (audio) \

Medical Definition of reagent

1 : a substance used (as in detecting or measuring a component, in preparing a product, or in developing photographs) because of its chemical or biological activity

More from Merriam-Webster on reagent

Britannica.com: Encyclopedia article about reagent

WORD OF THE DAY

Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!