What does anisotropic mean?
Anisotropic describes something whose properties are not the same in every direction. A material is anisotropic if measuring it along one axis gives different results from measuring it along another — wood, for instance, is stronger along the grain than across it, and certain crystals conduct heat or electricity more readily in some directions than others. The word is the direct opposite of isotropic, which characterizes substances that behave identically regardless of direction, such as most liquids and gases. Anisotropic appears almost exclusively in scientific and technical contexts: physics, crystallography, geology, and engineering rely on it to characterize crystals, composites, and layered media, while computer graphics borrowed the term for 'anisotropic filtering,' a technique that keeps textures sharp at oblique angles. For anyone reading technical literature, understanding this single adjective unlocks a fundamental concept about how real-world materials behave.
adjectiveHaving physical properties that differ depending on the direction in which they are measured, as opposed to being uniform in all directions.
- (of a material or medium) having physical properties that vary with direction of measurement
- (in computing/graphics) relating to texture filtering that preserves detail at oblique viewing angles
"Because mica is anisotropic, it splits cleanly along one plane but resists breaking across it."
"The crystal's anisotropic conductivity means current flows far more readily along one axis than another."
"Modern GPUs use anisotropic filtering to keep textures sharp when surfaces are viewed at steep angles."
Wood is anisotropic — that's why a plank splits easily along the grain but is nearly impossible to snap across it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of anisotropic
Anisotropic derives from Greek roots: 'an-' (a negative prefix meaning 'not') combined with 'isos' (equal) and 'tropos' (turn or direction), so it literally means 'not turning equally in all directions.' The term was coined in the nineteenth century within physics, alongside its positive counterpart isotropic, as scientists formalized the study of directional properties in crystals and light. It shares its Greek ancestry with related words such as entropy, heliotropic, and tropic, all built on the notion of turning or direction.
Related word forms
How anisotropic is actually used
A technical term used chiefly in physics, materials science, crystallography, and computer graphics; rarely encountered in everyday conversation. It carries no emotional connotation and is neutral in register, appearing mostly in formal or scientific writing.
Easily confused with anisotropic
Isotropic describes materials whose properties are identical in all directions, whereas anisotropic describes those whose properties vary with direction.