dihedronn.

/dʌɪˈhiːdrən/

Etymology: modern < Greek δι-, δισ- twice + ἕδρα seat, base: compare tetrahedron.

Mathematics.

In the geometrical theory of groups, the portion of two superposed planes bounded by (or contained within) a regular polygon. According to Klein, the six regular solids are dihedron (dieder), tetrahedron, octahedron, cube or hexahedron, ikosahedron, pentagon-dodecahedron.

ΚΠ

1828 N. Webster Amer. Dict. Eng. Lang. Dihedron, a figure with two sides.]

1888 G. G. Morrice tr. F. Klein Lect. on Ikosahedron 3 We can denote this latter by considering the portion of the plane limited by the sides of the n-gon to be doubled, as a regular solid—a dihedron, as we will say: only that this solid, contrary to the elementary notion of such, encloses no space.

This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2021).

单词	dihedron
释义	dihedronn. /dʌɪˈhiːdrən/ Etymology: modern < Greek δι-, δισ- twice + ἕδρα seat, base: compare tetrahedron. Mathematics. In the geometrical theory of groups, the portion of two superposed planes bounded by (or contained within) a regular polygon. According to Klein, the six regular solids are dihedron (dieder), tetrahedron, octahedron, cube or hexahedron, ikosahedron, pentagon-dodecahedron. ΚΠ 1828 N. Webster Amer. Dict. Eng. Lang. Dihedron, a figure with two sides.] 1888 G. G. Morrice tr. F. Klein Lect. on Ikosahedron 3 We can denote this latter by considering the portion of the plane limited by the sides of the n-gon to be doubled, as a regular solid—a dihedron, as we will say: only that this solid, contrary to the elementary notion of such, encloses no space. This entry has not yet been fully updated (first published 1896; most recently modified version published online March 2021). < n.1888
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