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Pronunciation varies by accent · adjective
(mineralogy) Of or pertaining to a wedge-shaped crystal form of the tetragonal or orthorhombic system..
1973, H. S. M. Coxeter, 3rd Edition, unnumbered page, To make a model of a disphenoid, cut out an acute angled triangle and fold it along the joins of the mid-points of the sides. The disphenoid is said to be rhombic or tetragonal according as the triangle is isosceles or scalene.
The mineral chalcopyrite commonly crystallizes in disphenoids that are very difficult to distinguish from tetrahedrons.
If you rotate the [tetragonal] disphenoid 90° around its 2-fold axis and then perform the operation of inversion through the center-point of the object, it will occupy its original position again.
In addition it should be remarked that there are two types of disphenoids, with different symmetries: the tetragonal disphenoid (having isosceles facets) and the rhombic one.
Use disphenoid when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Disphenoid means (mineralogy) Of or pertaining to a wedge-shaped crystal form of the tetragonal or orthorhombic system..
Common synonyms include bisphenoid, equifacial tetrahedron, isosceles tetrahedron.
The opposite depends on the specific sense.
1973, H. S. M. Coxeter, 3rd Edition, unnumbered page, To make a model of a disphenoid, cut out an acute angled triangle and fold it along the joins of the mid-points of the sides. The disphenoid is said to be rhombic or tetragonal according as the triangle is isosceles or scalene.
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