striation

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English[edit]

Etymology[edit]

stria +‎ -tion? or from striate

Noun[edit]

striation (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.
    • 2012 August 21, John Branch, “Snow Fall : The Avalanche at Tunnel Creek”, New York Time:
      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.
  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.