bipyramids
/baɪˈpɪrəmɪdz/
noun
- Plural of bipyramid; solid figures formed by two pyramids joined at their bases.
- Students learned to calculate the volume of bipyramids in their math class.
- Some natural crystals grow as bipyramids with perfect symmetry.
- The jeweler cut the gem into a pair of bipyramids for a unique necklace.