D defs.my
Entry 2 senses Webster, 1913

Fulguration

· Ful·gu·ra·tion · IPA /ˌfʊl.ɡjəˈɹeɪ.ʃən/
01 n. The act of lightening.
  1. 1.
    The act of lightening.[R.]
  2. 2.
    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.(Assaying) Also: blick
    “A phenomenon called, by the old chemists, fulguration.” — Ure.