Phos"pham"ic

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]