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bipyramid

American

[bahy-pir-uh-mid] / baɪˈpɪr ə mɪd /

noun

Crystallography.

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

bipyramid British

/ ˌbaɪˈpɪrəmɪd /

noun

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

Other Word Forms

bipyramidal adjective

Etymology

Origin of bipyramid

bi- ¹ + pyramid

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Tetragonal bipyramid of the second order.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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 Project Gutenberg

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023