{ An"i*so*trope` (&?;), 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.