Source : Webster's Revised Unabridged Dictionary (1913)

Anisotrope \An"i*so*trope`\, Anisotropic \An`i*so*trop"ic\, a.
   [Gr. ? unequal + ? a turning, ? to turn.] (Physics)
   Not isotropic; having different properties in different
   directions; thus, crystals of the isometric system are
   optically isotropic, but all other crystals are anisotropic.