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Striations in rocks.
Striations in a tile.
Striations in muscles (particularly the chest).


striate +‎ -ion


striation (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.
    • 2012, John Branch, “Snow Fall : The Avalanche at Tunnel Creek”, in New York Time[1]:
      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.



  • striation in The Century Dictionary, The Century Co., New York, 1911.
  • striation at OneLook Dictionary Search