rhodammonium noun1 •(no longer used) A cation, Rh₂(NH₃)₁₀⁶⁺, containing rhodium and ammonia.Rhodammonium Hydroxide, Rh₂(NH₃) ₁₀ (OH)₆, is obtained by warming rhodammonium chloride with water and silver oxide, and evaporating the solution. — 1891
