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phosphonium

[fos-foh-nee-uh m] /fɒsˈfoʊ ni əm/
noun, Chemistry
1.
the positively charged group PH 4 + .
Origin
1865-1870
1865-70; phosph(orus) + (amm)onium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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