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]