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A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.

icositetrahedron. -- Trigonal trisoctahedron, a trisoctahedron each face of which is an isosceles triangle.

ylon basilare, a small species the larva of which bores in the stems, and Ampeloglypter sesostris, a small reddish brown weevil (called also vine weevil), which produces knotlike galls on the branches. (b) A clearwing moth (Ægeria polistiformis), whose larva bores in the roots of the grapevine and is often destructive.…

Virtuosos, collectively. Carlyle.