having ninety faces (in geometry); describing a polyhedron with ninety flat surfaces.
From Greek ennea (nine) + conta (derived from -conto- meaning 'ninety') + hedron (from Greek hedra meaning 'face' or 'side'). A technical mathematical term combining Greek number roots.
Mathematicians discovered that certain crystal structures form as enneacontahedral shapes—ninety-sided geometric perfection found in nature that makes you realize the universe is far more geometrically sophisticated than ancient humans imagined.
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