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phosphonium

[ fos-foh-nee-uhm ]
/ fɒsˈfoʊ ni əm /
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noun Chemistry.
the positively charged group PH4+.
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Origin of phosphonium

First recorded in 1865–70; phosph(orus) + (amm)onium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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