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tetrapyramid
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tetrapyramid n.
Brit. 
/ˌtɛtrəˈpɪrəmɪd/
, /ˌtɛtrəˈpɪrəmɪd/U.S. /ˌtɛtrəˈpɪrəˌmɪd/
Crystallography in the triclinic system, that form in which each of the two faces intercepts the three crystallographic axes./ˌtɛtrəˈpɪrəˌmɪd/<
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