Having the shape or properties of a decahedron; relating to a solid with ten faces.
From decahedron + -al (adjective suffix). The suffix -al converts the noun into an adjective describing objects or properties with decahedron-like characteristics.
Decahedral shapes pop up in crystals and atoms—some minerals naturally form decahedra as they grow, showing that the beauty of geometry isn't just in math class but written into the structure of the physical world!
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