Having the shape or form of a bipyramid; relating to or characterized by two pyramids joined at their bases.
From bipyramid + -al (adjective suffix). This term emerged in 19th-century chemistry and crystallography to describe molecular shapes.
When chemistry teachers say a molecule has a 'bipyramidal geometry,' they're describing its three-dimensional shape—and this shape directly determines the molecule's properties, reactivity, and how it bonds with other molecules.
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