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| to remove impurities from a gas by chemical means, as sulfur dioxide from smokestack gas or carbon dioxide from exhaled air in life-support packs |
| a salt of hydrofluoric acid consisting of fluorine, as sodium fluoride, NaF, or a compound containing fluorine, as methyl fluoride, CH3F |
| sacrificial anode | |
| —n | |
| metallurgy an electropositive metal, such as zinc, that protects a more important electronegative part by corroding when attacked by electrolytic action | |