Source : Webster's Revised Unabridged Dictionary (1913)

Phospham \Phos"pham\, n. [Phosphorus + ammonia.] (Chem.)
   An inert amorphous white powder, {PN2H}, obtained by passing
   ammonia over heated phosphorus. [Spelt also {phosphame}.] --
   {Phos"pham"ic}, a.