anisotropy

[ an-ahy-so-truh-pee ]

noun

Physics. the fact of having unequal physical properties along different axes:Even crystals with a simple cubic lattice structure, such as salt, display optical anisotropy; that is, the light propagates differently in different directions.
Botany. the fact of having different rates of growth in different directions:Anisotropy is a nearly ubiquitous feature of plant growth; it is necessary, if a growing plant organ is to produce any other form than a sphere.

Origin of anisotropy

First recorded in 1875–80; an-¹ + isotrop(ic) + -y³

The diurnal curve of movement should now show an inversion, if that movement was solely determined by the anisotropy of the organ.
Life Movements in Plants | Sir Jagadis Chunder Bose

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