Hypertext Webster Gateway: "uniaxial"
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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