disphenoid
Word Rarity
Very rare
Frequency: Zipf frequency 0.00 in modern English
17
Scrabble Score
10
Letters
2
Syllables
8
Unique Chars
Meaning
adj
Of or pertaining to a wedge-shaped crystal form of the tetragonal or orthorhombic system.
adj
Of or pertaining to a crystal form bounded by eight scalene triangles arranged in pairs, constituting a tetragonal scalenohedron.
noun
A non-regular tetrahedron whose four faces are congruent acute-angled triangles.
Example Sentences
- "The mineral chalcopyrite commonly crystallizes in disphenoids that are very difficult to distinguish from tetrahedrons."
- "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."
- "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."