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(Science: chemistry) A solid bounded by twenty-four equal and similar trapeziums; a tetragonal trisoctahedron. See the note under Trisoctahedron.
A tetartohedral solid of the hexagonal system, bounded by six trapezoidal planes. The faces of this form are common on quartz crystals.
Origin: NL, from trapezium _ Gr. Seat, base, fr. To sit.
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