sacrificial anode

noun
Chemistry. an anode that is attached to a metal object subject to electrolysis and is decomposed instead of the object.
Origin:
1975–80

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
sacrificial anode
 
—n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Sacrificial anode is always a great word to know.
So is aromatic. Does it mean:
a purplish-red, water-soluble powder, C20H11N2O10Na3, an azo dye used chiefly to color pharmaceuticals, food, and garments
pertaining to an aromatic compound, which contains one or more benzene or equivalent heterocyclic rings: many such compounds have an agreeable odor
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Example sentences
Cathodic protection of the piping shall be provided by a sacrificial anode
  system.
Water heaters come with internal sacrificial anode rods to protect against
  rusting.
The zinc in this case is called a sacrificial anode, and the steel will be
  protected as long as any zinc remains.
For sacrificial anode systems, periodic underwater inspections shall be
  performed and observations recorded.
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