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A solid figure inclosed or bounded by four triangles.

A twenty-four-sided solid; a tetragonal trisoctahedron or trapezohedron.

(Crystalloq.) A solid related to a tetrahedron, and contained under twelve equal triangles.

welve quadrilateral faces. It is a hemihedral form of the isometric system, allied to the tetrahedron.

ght solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained under four of the planes of an octahedron. -- Hem`i*he"dral*ly, adv.

A solid hemihedrally derived. The tetrahedron is a hemihedron.

nsexual; philosophical. Platonic bodies, the five regular geometrical solids; namely, the tetrahedron, hexahedron or cube, octahedron, dodecahedron, and icosahedron. -- Platonic love, a pure, spiritual affection, subsisting between persons of opposite sex, unmixed with carnal desires, and regarding the mind only and i…

hedron whose faces are equal regular polygons. There are five regular polyhedrons, -- the tetrahedron, the hexahedron, or cube, the octahedron, the dodecahedron, and the icosahedron. -- Regular sales (Stock Exchange), sales of stock deliverable on the day after the transaction. -- Regular troops, troops of a standing…

Having the form of the regular tetrahedron.

trisoctahedron each face of which is a quadrilateral; called also trapezohedron and icositetrahedron. -- Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle.