striation

Noun

striation (countable and uncountable, plural striations)

1. (countable) 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) One of a number of parallel scratch lines in rock outcrops, formed when glaciers dragged rocks across the landscape.
   • 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 December 26, John Branch, “Snow Fall: The Avalanche at Tunnel Creek”, in The New York Times, New York, N.Y.: The New York Times Company, →ISSN, →OCLC, archived from the original on 14 Nov 2013
3. The action of marking with a stria.
4. The result of being marked with a stria.
5. a parallel series of small grooves, channels, or impressions typically within a metal roof panel used to help reduce the potential for oil-canning.