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Uniaxial   Listen
Uniaxial  adj.  
(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.
(Biol.) Having only one axis; developing along a single line or plane; opposed to multiaxial.

Collaborative International Dictionary of English 0.48

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"Uniaxial" Quotes from Famous Books

... according to the amount of iron present. Well-developed crystals are met with only in the species clinochlore and penninite; those of the former are six-sided plates and are optically biaxial, whilst those of the latter have the form of acute rhombohedra and are usually optically uniaxial. The species prochlorite and corundophilite also occur as more or less distinct six-sided plates. These four better crystallized species are grouped together by G. Tschermak as orthochlorites, the finely scaly and ...
— Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 - "Chitral" to "Cincinnati" • Various

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