estruation ( synonym found)
Definition of estruation:

°One of a number of parallel grooves and ridges in a rock or rocky deposit, formed by repeated twinning or cleaving of crystals.
°One of a number of parallel scratch lines in rock outcrops, formed when glaciers dragged rocks across the landscape.
Definition of estruation:

°One of a number of parallel grooves and ridges in a rock or rocky deposit, formed by repeated twinning or cleaving of crystals.
°One of a number of parallel scratch lines in rock outcrops, formed when glaciers dragged rocks across the landscape.
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