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.