U`ni*ax"i*al (?), a. [Uni + axial.]

1. Crystallog.

Having but one optic axis, or line of no double refraction.

⇒ 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.

 

© Webster 1913.

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