sulfonium[sul fō′nē əm]
sulfonium definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a monovalent radical containing three alkyl radicals and one atom of sulfur, as the triethyl sulfonium radical (CH)S
Origin: ModL: see sulfo- and amp; -onium
sulfonium definition by American Heritage Dictionary
A positive ion or univalent radical containing trivalent sulfur, such as H3S.
Origin: sulf(o)- + (amm)onium.