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Definitions

Century Dictionary and Cyclopedia

  1. 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.

Wiktionary

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

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‘onium’ has been looked up 2504 times, and has a Scrabble score of 7.