Plural form referring to multiple geometric solids with six faces, similar to a hexahedron.
From Greek 'hex' (six) + 'hedra' (face). This is likely a variant or archaic plural of 'hexahedron,' the most famous example being a cube.
A cube is the most perfect hexdra possible—it's so geometrically ideal that it appears in nature in salt crystals and in architecture from ancient times to modern buildings.
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