What's the difference between icositetrahedron and trapezohedron?

Icositetrahedron

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Definition:

• (n.) A twenty-four-sided solid; a tetragonal trisoctahedron or trapezohedron.

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Trapezohedron

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Definition:

• (n.) A solid bounded by twenty-four equal and similar trapeziums; a tetragonal trisoctahedron. See the Note under Trisoctahedron.
• (n.) A tetartohedral solid of the hexagonal system, bounded by six trapezoidal planes. The faces of this form are common on quartz crystals.

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