Ful″gu‐ra′tion (?), n. [L. fulguratio: cf. F. fulguration.] 1. The act of lightening. 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.