Etymology: < participial stem of Latin coruscāre to vibrate, glitter, sparkle, gleam.
a. intr. To give forth intermittent or vibratory flashes of light; to shine with a quivering light; to sparkle, glitter, flash
.b. with cognate object. (OED)
"A double rainbow corruscated into being."
- Terry Pratchett, "Close to the Edge", 1983
Not quite sure why he's spelling it with two rs.