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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.
Origin
1975-1980
1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sacrificial-anode

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
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