bipyramid

bipyramid

[bahy-pir-uh-mid]
noun Crystallography.
a form symmetrical about a plane dividing it into two pyramids.
Also called dipyramid.


Origin:
bi-1 + pyramid

bipyramidal [bahy-pi-ram-i-dl] , adjective
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World English Dictionary
bipyramid (ˌbaɪˈpɪrəmɪd)
 
n
a geometrical form consisting of two pyramids with a common polygonal base

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