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sulfonium

[suhl-foh-nee-uh m]
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noun Chemistry.
  1. the positively charged group H3S+, its salts, or their substitute products.
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Origin of sulfonium

First recorded in 1890–95; sulf(ur) + (amm)onium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018