ELECTROPOION
E*lec`tro*poi"on, n., or Electropoion fluid. [NL.; electro- + Gr.
poiw^n, p. pr. of poiei^n to make.] (Elec.)
Definition: An exciting and depolarizing acid solution used in certain
cells or batteries, as the Grenet battery. Electropoion is best
prepared by mixing one gallon of concentrated sulphuric acid diluted
with three gallons of water, with a solution of six pounds of
potassium bichromate in two gallons of boiling water. It should be
used cold.
Source: Webster’s Unabridged Dictionary 1913 Edition