bipyramid

[ bahy-pir-uh-mid ]

noun

, Crystallography.

1. a form symmetrical about a plane dividing it into two pyramids.

bipyramid

/ ˌbaɪˈpɪrəmɪd /

noun

1. a geometrical form consisting of two pyramids with a common polygonal base

Other Words From

• bi·py·ram·i·dal [bahy-pi-, ram, -i-dl], adjective

Word History and Origins

Origin of bipyramid¹

bi- ¹ + pyramid

Example Sentences

Hexagonal bipyramid (fig. 70), bounded by twelve isosceles triangles each of which are equally inclined to two planes of symmetry.

From Project Gutenberg

The general form is bounded by twelve scalene triangles and is a ditrigonal bipyramid.

From Project Gutenberg

It may be considered as the hemihedral form of the ditetragonal bipyramid.

From Project Gutenberg