\Ful"gu*ra`tion\, n. [L. fulguratio: cf. F.
fulguration.]
1. The act of lightening. [R.] --Donne.
2. (Assaying) The sudden brightening of a fused globule of
   gold or silver, when the last film of the oxide of lead or
   copper leaves its surface; -- also called {blick}.
         A phenomenon called, by the old chemists,
         fulguration.                          --Ure.