uniaxial

Adjective

u=ni=ax=i=al

CIDE DICTIONARY

uniaxial, a. [Uni + axial.].

Having but one optic axis, or line of no double refraction. [1913 Webster]
" In uniaxial crystals, the optic axis has the direction of the vertical crystallographic axis. All tetragonal and hexagonal crystals are uniaxial." [1913 Webster]
Having only one axis; developing along a single line or plane; -- opposed to multiaxial. [1913 Webster]

uniaxial, adj. having a single axis.

Derivative

uniaxially adv.