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1869, in the meaning defined above
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From the Editors at Merriam-Webster
'Aluminum' or 'Aluminium'?
A tale of two spellings
aluminum gallium arsenide
Cite this Entry
“Aluminum hydrate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aluminum%20hydrate. Accessed 16 Aug. 2022.
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