The Collaborative International Dictionary of English v.0.48:

Plasmon \Plas"mon\, n. [Cf. Plasma.]
   A flourlike food preparation made from skim milk, and
   consisting essentially of the unaltered proteid of milk. It
   is also used in making biscuits and crackers, for mixing with
   cocoa, etc. A mixture of this with butter, water, and salt is
   called