coruscation

noun

1. (countable, uncountable)A sudden display of brilliance; a flashing of light; a sparkle.

   “[I]n the dusky galleries, duskier with unwashed heads, is a strange 'coruscation,'—of impromptu billhooks.”

   “The one, as a brilliant coruscation playing in a summer sky, might enchant the fancy and ensure the suffrage of a moment; the other, as a lovely constellation, though less vivid, yet from its undeviating steadfastness never failed to leave upon the observer impressions more truly gratifying, solid, and lasting.”

   “2001, Oliver Sacks, Uncle Tungsten: Memories of a Chemical Boyhood, Alfred A. Knopf (2001), 6, All of these things—the rubbed amber, the magnets, the crystal radio, the clock dials with their tireless coruscations—gave me a sense of invisible rays and forces, a sense that beneath the familiar, visible world of colors and appearances there lay a dark, hidden world of mysterious laws and phenomena.”