cathode

noun
cath·ode | \ˈka-ˌthōd \

Definition of cathode 

1 : the electrode of an electrochemical cell at which reduction occurs:

a : the negative terminal of an electrolytic cell

b : the positive terminal of a galvanic cell

2 : the electron-emitting electrode of an electron tube broadly : the negative electrode of a diode — compare anode

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Other Words from cathode

cathodal \ˈka-ˌthō-dᵊl \ adjective
cathodally adverb
cathodic \ka-ˈthä-dik, -ˈthō- \ adjective
cathodically \-di-k(ə-)lē \ adverb

Examples of cathode in a Sentence

Recent Examples on the Web

The beautiful clock charges via USB and is remote controlled, yet displays time in a Nixie Tube—an old-fashioned cathode tube with neon filaments. John Wenz, Popular Mechanics, "This Retro Cathode Ray Tube Clock Is Powered by USB," 13 Feb. 2015 At the cathode, catalysts split N2 molecules and prompt the hydrogen ions and electrons to react with nitrogen and make ammonia. Robert F. Service, Science | AAAS, "Ammonia—a renewable fuel made from sun, air, and water—could power the globe without carbon," 12 July 2018 The protons flow through an electrolyte and a proton-permeable membrane to the cathode, while the electrons make the journey through a wire. Robert F. Service, Science | AAAS, "Ammonia—a renewable fuel made from sun, air, and water—could power the globe without carbon," 12 July 2018 Essentially, a violent enough jolt can break the non-conductive wall that separates a battery's anode and cathode, which causes a big, nasty short inside the system. Eric Limer, Popular Mechanics, "This Flaming Robot Shows Just How Dangerous a Busted Battery Can Be," 7 July 2016 As cobalt has become pricier and scarcer, some battery makers have produced cobalt-lite cathodes by raising the nickel content—to as much as eight times the amount of cobalt. The Economist, "What if China corners the cobalt market?," 22 Mar. 2018 Because the biotattoo already contained the electron-sensing enzyme, the researchers just needed to add a cathode molecule. Kathryn Free, Popular Mechanics, "A Temporary Tattoo to Track Your Workout and Charge Your Phone," 13 Aug. 2014 Most handheld and portable electronics use lithium ion batteries, which are made up of an anode, a cathode, a separator, an electrolyte, a positive current, and a negative current. Lauren Goode, WIRED, "Batteries Still Suck, But Researchers Are Working on It," 22 May 2018 After cooling, Chen’s team takes the regenerated particles and makes new cathodes. Rob Nikolewski, sandiegouniontribune.com, "UCSD professor devises way to recycle lithium-ion batteries," 16 Mar. 2018

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

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First Known Use of cathode

1834, in the meaning defined at sense 1

History and Etymology for cathode

Greek kathodos way down, from kata- + hodos way

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Statistics for cathode

Last Updated

31 Aug 2018

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Time Traveler for cathode

The first known use of cathode was in 1834

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More Definitions for cathode

cathode

noun

English Language Learners Definition of cathode

: the part of an electrical device (such as a battery) where electrons enter

cathode

noun
cath·ode | \ˈkath-ˌōd \

Medical Definition of cathode 

1 : the electrode of an electrochemical cell at which reduction occurs: as

a : the negative terminal of an electrolytic cell

b : the positive terminal of a storage battery that is delivering current

2 : the electron-emitting electrode of an electron tube — compare anode

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More from Merriam-Webster on cathode

Spanish Central: Translation of cathode

Nglish: Translation of cathode for Spanish Speakers

Britannica.com: Encyclopedia article about cathode

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