anisotropy
UK[ˌænaɪˈsɒtrəpi]US[ˌænaɪˈsɑːtrəpi]
n
The property of being directionally dependent, having different physical properties when measured along different axes.
n
(Physics/Geology) The condition of a substance or material exhibiting different values of a property (e.g., electrical conductivity, elasticity, seismic wave velocity) in different directions.
Morpheme Breakdown
an
iso
tropy
an
not
iso
equal
tropy
turning, condition
Etymology
The term 'anisotropy' is a modern scientific coinage, constructed from Greek components to precisely describe a physical concept. It combines the negative prefix 'an-' with the root 'iso-' (equal) and the suffix '-tropy' (related to turning or direction). Literally, it means "not equal in direction," which perfectly captures its modern technical meaning. The word 'isotropy,' meaning identical properties in all directions, was formed first, with 'anisotropy' logically derived as its opposite. This etymological construction follows a clear, logical path from the literal Greek meanings ("not" + "same" + "direction") to the abstract scientific principle of directional dependence.
Analysis
Structure: an (not) + iso (equal) + tropy (turning, condition)
an: Greek origin, a prefix meaning "not" or "without".
iso: Greek origin (from 'isos'), meaning "equal" or "same".
tropy: Greek origin (from 'tropos', meaning "a turn" or "direction"), here used as a noun-forming suffix indicating a condition or property related to direction or turning.
Examples
The anisotropy of the crystal's structure affects how it conducts electricity.
Seismic anisotropy in the Earth's mantle provides clues about the flow of material deep within the planet.
Engineers must account for the material's anisotropy when designing composite parts for aircraft.