a geometrical form consisting of two pyramids with a common polygonal base
bipyramid in American English
(baiˈpɪrəmɪd)
noun
Crystallography
a form symmetrical about a plane dividing it into two pyramids
Also called: dipyramid
Derived forms
bipyramidal (ˌbaipɪˈræmɪdl)
adjective
Word origin
[bi-1 + pyramid]bi- is a combining form meaning “twice,” “two,” used in the formation of compound words.Other words that use the affix bi- include: biceps, bilabial, bilateral, bilingual, bimodal
Examples of 'bipyramid' in a sentence
bipyramid
The bond angles between the n-butyl groups are widened [135.64 (7)–146.20 (7)°] in comparison with an ideal trigonal bipyramid.
Hans Reuter, Coco K. Y. A. Okio 2017, 'Bis(μ-benzoato-κ2O:O′)bis(benzoato-κO)octabutyldi-μ3-oxido-tetratin(IV)', Acta Crystallographica Section E: Crystallographic Communicationshttp://scripts.iucr.org/cgi-bin/paper?S2056989017001505. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
In its turn, holmium almost fully occupies the 6h position at the center of a seven-coordinated pentagonal bipyramid.
Luis Fuentes, Maria E. Fuentes, Lauro Bucio, Eligio Orozco, Ivonne Rosales 2009, 'A synchrotron study of Na2.27Ho7.73(SiO4)6O0.72', Acta Crystallographica Section Ehttp://scripts.iucr.org/cgi-bin/paper?S1600536809011866. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)