What does striation mean?
A striation is a groove, ridge, line, or narrow band on a surface, especially one produced by repeated movement, pressure, or friction. The term is widely used in geology to describe parallel scratches left in bedrock by moving ice, and in biology and materials science to refer to repeated linear markings on tissues, shells, crystals, or worked surfaces. In everyday description, the word conveys a more precise or technical idea than simply "line": a striation is typically narrow, regular, and physically impressed or raised. The word is especially associated with glacial striations, whose direction and depth can help reconstruct the movement and behavior of ancient ice. Because it is somewhat specialized, "groove," "ridge," or "streak" will often be clearer in ordinary prose.
nounA striation is a groove, ridge, line, or narrow band, especially one formed on a surface by repeated movement or pressure. In geology and materials science, the term refers to repeated parallel markings or layers.
- A groove, ridge, or narrow line on a surface.
- A repeated series of parallel lines or bands, especially in rock, metal, or other materials.
- A pattern of grooves or markings produced by repeated movement, pressure, or friction.
"The polished stone shows faint striations where the tool repeatedly scraped across its surface."
"The microscope revealed fine striations across the surface of the fossil."
"Parallel striations in the bedrock provide evidence that glaciers once moved through the valley."
The plural is standard when describing multiple grooves, lines, or bands.
"The rock face preserves several striations from the movement of ancient ice."
Glacial striations are scratches left in rock by stones dragged beneath moving ice, preserving a record of the ice's movement.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does striation come from?
The word comes from the Latin stria, meaning a furrow or groove, and ultimately relates to Latin striae, used for narrow channels or lines on a surface. The English form developed through the adjective striate and the Latin-derived noun striation, both associated with streaks, grooves, and bands. Related forms include striate and striated, which describe surfaces marked with parallel lines.
Related word forms
How striation is actually used
The word is most common in technical and descriptive contexts, especially geology, biology, materials science, and descriptions of surfaces marked by grooves or bands. In general writing, a simpler term such as "groove," "ridge," or "line" is often more natural.
Easily confused with striation
A striation is a physical groove, ridge, or band on a surface, whereas striking is an action that forcefully hits or affects something.