[an-ahy-suh-trop-ik, -troh-pik, an-ahy-]
Physics. of unequal physical properties along different axes. Compare isotropic ( def 1 ).
Botany. of different dimensions along different axes.

1875–80; an-1 + isotropic

anisotropically, adverb
anisotropy [an-ahy-so-truh-pee] , anisotropism, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anisotropic (ænˌaɪsəʊˈtrɒpɪk, ˌænaɪ-)
1.  not isotropic; having different physical properties in different directions: anisotropic crystals
2.  (of a plant) responding unequally to an external stimulus in different parts of the plant

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1879, a compound variously explained as formed from Gk. anisos "unequal" (from an- "not" + iso- "equal") + tropikos "belonging to a turning," from tropos "a turning" (see trope), or as an- "not" + isotropic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anisotropic an·i·so·trop·ic (ān-ī'sə-trŏp'ĭk, -trō'pĭk)

  1. Not isotropic.

  2. Having physical properties that differ according to the direction of measurement.

an·i'so·trop'i·cal·ly adv.
an'i·sot'ro·pism (-sŏt'rə-pĭz'əm) or an'i·sot'ro·py (-sŏt'rə-pē) n.
The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
anisotropic   (ān-ī'sə-trō'pĭk, -trŏp'ĭk, ān'ī-)  Pronunciation Key 
Differing according to orientation, as light scattered by a liquid crystal; light striking the liquid crystal's surface at a 90° angle might not be reflected (so the surface appears dark when viewed head-on), while light striking it at shallower angles is reflected (so the surface appears illuminated when viewed from a shallow angle). Compare isotropic.
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Example sentences
Understanding the core's anisotropic structures may tell us how it's growing-and if the growing will end.
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