uniaxial

adjective

1. having one axis.
2. Crystallography. (of a crystal) having one direction in which double refraction does not occur.
3. Botany. (of a plant) having a primary stem that does not branch and that terminates in a flower.

adjective

1. (esp of plants) having an unbranched main axis
2. (of a crystal) having only one direction along which double refraction of light does not occur