Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. any cation derived by the addition of a proton to the hydride of any element of the nitrogen, chalcogen or halogen families
  • n. any organic derivative of these compounds
  • n. the bound pair of a particle and its antiparticle

from The Century Dictionary and Cyclopedia

  • n. In chem., a termination given to the names of compound radicals which are analogous in structure and chemical function to ammonium, NH4, as phosphonium, PH4, or tetramethylphosphonium, P (CH3)4.

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