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sacrificial anode

noun

  1. Chemistry. an anode that is attached to a metal object subject to electrolysis and is decomposed instead of the object.


sacrificial anode

noun

  1. metallurgy an electropositive metal, such as zinc, that protects a more important electronegative part by corroding when attacked by electrolytic action
“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
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Word History and Origins

Origin of sacrificial anode1

First recorded in 1975–80
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Example Sentences

After that brick — known as a sacrificial anode — meets its untimely demise, another is bolted in its place.

Don�t ignore a scratch and unwittingly let your aluminum outboard motor become a sacrificial anode.

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