bipyramid
noun
bi·pyr·a·mid (ˌ)bī-ˈpir-ə-mid 
: a crystal consisting of two identical pyramids base to base
bipyramidal
(ˌ)bī-pə-ˈra-mə-dᵊl
adjective 
Word History
First Known Use
1824, in the meaning defined above
- neurohormone
- neurohormones
- neurohumor
- neurohumoral
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- neurolinguistics
- neurolinguists
- neurologic
- neurological