51Թ

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bipyramid

[ bahy-pir-uh-mid ]

noun

Crystallography.
  1. a form symmetrical about a plane dividing it into two pyramids.


bipyramid

/ ˌɪˈɪəɪ /

noun

  1. a geometrical form consisting of two pyramids with a common polygonal base
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Other 51Թ Forms

  • ····岹 [bahy-pi-, ram, -i-dl], adjective
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51Թ History and Origins

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Example Sentences

Examples have not been reviewed.

Tetragonal bipyramid of the second order.

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It may be considered as the hemihedral form of the ditetragonal bipyramid.

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The general form is bounded by twelve scalene triangles and is a ditrigonal bipyramid.

From

The hexagonal bipyramid so common in quartz is geometrically similar to this form, but it really is a combination of two rhombohedra, a direct and an inverse, the faces of which differ in surface characters and often also in size.

From

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