Thursday, September 24, 2009


Dihedral: Dihedral refers to the intersection of two surfaces. Dihedral most immediately shares its etymology with the platonic solids: tetrahedron, hexahedron (aka cube), octahedron, dodecahedron, and icosahedron. More distantly dihedral shares it etymology with sit and chair. In algebra, a dihedral group is a finite group with both rotational and reflective symmetries.
The bird ascended and began a dihedral [?] circle over the twenty acres of stumps behind Galloway's crew.
A Book for Today: Serena by Ron Rash

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