striation

English

Etymology

stria +‎ -tion? or from striate

Noun

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.
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.