D defs.my
Entry 2 senses Webster, 1913

Uniaxial

· U·ni·ax·i·al · IPA
01 a. Having but one optic axis, or line of no double refraction.
  1. 1.
    Having but one optic axis, or line of no double refraction.(Crystallog.)
  2. 2.
    Having only one axis; developing along a single line or plane; -- opposed to multiaxial.(Biol.)