The Collaborative International Dictionary of English v.0.48:

Fulguration \Ful"gu*ra`tion\, n. [L. fulguratio: cf. F.
   fulguration.]
   1. The act of lightening. [R.] --Donne.
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   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.
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            A phenomenon called, by the old chemists,
            fulguration.                          --Ure.
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