trapezohedron

plural trapezohedra · plural trapezohedrons

1. chemistryAny of a class of polyhedra that have kite-shaped faces and are dual polyhedra of antiprisms.

   The general form is called the tetragonal trapezohedron. In this case also there are both left- (Fig. 97) and right-handed (Fig. 98) forms.

   1969, Carl W. Correns, translated by William D. Johns, Introduction to Mineralogy: Crystallography and Petrology, 2nd edition, page 40

   1 more example

   This trapezohedron, or antidiamond, is composed of ten quadrilaterals. In each quadrilateral, three of the angles are 108° and one is 36°.

   2002, John Montroll, A Plethora of Polyhedra in Origami, page 105

   Synonyms: antibipyramid, antidipyramid, deltohedron

2. chemistryA deltoidal icositetrahedron.

   A trapezohedron has 24 equal faces, each a four-sided figure or trapezium. Unlike the forms already described, which are always the same, there are several different trapezohedrons, all having the same number of faces but differing in the angles between the faces.

   1998, Cornelius S. Hurlbut Jr., W. Edwin Sharp, Dana's Minerals and How to Study Them (After Edward Salisbury Dana), page 23

   Synonyms: deltoidal icositetrahedron, strombic icositetrahedron, tetragonal icosikaitetrahedron, tetragonal trisoctahedron, trapezoidal icositetrahedron