1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Uniaxial  \U`ni*ax"i*al\,  a.  [Uni  +  axial.] 
  1.  (Crystallog.)  Having  but  one  optic  axis,  or  line  of  no 
  double  refraction. 
 
  Note:  In  uniaxial  crystals,  the  optic  axis  has  the  direction 
  of  the  vertical  crystallographic  axis.  All  tetragonal 
  and  hexagonal  crystals  are  uniaxial. 
 
  2.  (Biol.)  Having  only  one  axis;  developing  along  a  single 
  line  or  plane;  --  opposed  to  multiaxial. 

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