Having nine faces; relating to or describing a solid with nine plane surfaces.
From 'enneahedra' or 'enneahedron' + the adjectival suffix '-al'. The term describes the geometric properties of polyhedra with nine faces.
In crystallography, 'enneahedral' describes real crystals that form with nine faces—and these rare crystal shapes helped scientists prove that atoms arrange themselves in mathematically perfect patterns, making this word a bridge between abstract geometry and the physical world.
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