D defs.my
Entry 2 senses Webster, 1913

Coruscation

/(k?r`?s-k?"sh?n)/ · Cor·us·ca·tion · IPA /ˌkɒɹəsˈkeɪʃən/
01 n. A sudden flash or play of light.
  1. 1.
    A sudden flash or play of light.
    “A very vivid but exceeding short-lived splender, not to call �t a little coruscation.” Boyle.
  2. 2.
    A flash of intellectual brilliancy.
    “He might have illuminated his times with the incessant cor��cations of his genius.” I. Taylor.