anisotropic
Pronunciation: /ˌanʌɪsə(ʊ)ˈtrɒpɪk/
adjective
Physics- (of an object or substance) having a physical property which has a different value when measured in different directions. An example is wood, which is stronger along the grain than across it. Often contrasted with isotropic.
- (of a property or phenomenon) varying in magnitude according to the direction of measurement: electron scattering is anisotropic

Origin:
late 19th century: from Greek anisos 'unequal' + tropos 'turn' + -ic