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bipyramid

[bahy-pir-uh-mid]
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noun Crystallography.
  1. a form symmetrical about a plane dividing it into two pyramids.
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Origin of bipyramid

Also called dipyramid.
Related formsbi·py·ram·i·dal [bahy-pi-ram-i-dl] /ˌbaɪ pɪˈræm ɪ dl/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for bipyramid

bipyramid

noun
  1. a geometrical form consisting of two pyramids with a common polygonal base
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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