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Meaning of uniaxial

u•ni•ax•i•al

Pronunciation: (y"nē-ak'sē-ul), [key]
— adj.
  1. having one axis.
  2. (of a crystal) having one direction in which double refraction does not occur.
  3. (of a plant) having a primary stem that does not branch and that terminates in a flower.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.