Definition of "striation"

striation

noun
countable and uncountable, plural striations
1. (countable, mineralogy) One of a number of parallel grooves and ridges in a rock or rocky deposit, formed by repeated twinning or cleaving of crystals.
2. (countable, geomorphology) One of a number of parallel scratch lines in rock outcrops, formed when glaciers dragged rocks across the landscape.
  Quotations
  The energy raised the temperature of the snow a couple of degrees, and the friction carved striations high in the icy sides of the canyon walls.
  2012, John Branch, “Snow Fall : The Avalanche at Tunnel Creek”, in New York Time‎
3. The action of marking with a stria.
4. The result of being marked with a stria.
5. (roofing) a parallel series of small grooves, channels, or impressions typically within a metal roof panel used to help reduce the potential for oil-canning.