bi-pyramidal

bi·pyr·a·mid

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


Origin:
bi-1 + pyramid

bi·py·ram·i·dal [bahy-pi-ram-i-dl] , adjective
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World English Dictionary
bipyramid (ˌbaɪˈpɪrəmɪd) [Click for IPA pronunciation guide]
 
n
a geometrical form consisting of two pyramids with a common polygonal base

Collins English Dictionary - Complete & Unabridged 10th Edition
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Bi-pyramidal is always a great word to know.
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a gadget; dingus; thingumbob.
a fool or simpleton; ninny.
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