spent oxide
noun
: iron oxide that has been used in gas manufacture to purify coal gas by removing chiefly hydrogen sulfide and sometimes cyanogen, that generally has formed a coating on shavings and sawdust, and that may be used as a source of sulfur and of cyanogen compounds
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“Spent oxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spent%20oxide. Accessed 23 Nov. 2024.
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