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Definitions of ammonium
  1. noun
    the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion

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Definition that contains ammonium
  • alum a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
  • ammonium carbonate a carbonate of ammonium; used in the manufacture of smelling salts and baking powder and ammonium compounds
  • ammonium alum a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
  • smelling salts a pungent preparation of ammonium carbonate and perfume; sniffed as a stimulant to relieve faintness
  • carbamic acid an acid that is known only by virtue of its salts (as ammonium carbamate) or its esters (as urethane)
  • nitrobacterium any of the bacteria in the soil that take part in the nitrogen cycle; they oxidize ammonium compounds into nitrites or oxidize nitrites into nitrates
  • spirits of ammonia a solution of ammonium carbonate in ammonia water and alcohol
  • nitrification the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants)
  • quaternary ammonium compound a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface-active agents, disinfectants, and in drugs
  • ammonia alum a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
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