Plural of hexahedron; multiple three-dimensional geometric solids each having six faces.
From Greek 'hex-' (six) and 'hedra' (face/side), with '-a' as the Latin plural ending. The singular 'hexahedron' emerged in ancient Greek geometry.
A cube is the most famous hexahedron, but there are actually other six-faced solids with different shaped faces—mathematicians study all possible hexahedra because they're fundamental building blocks of 3D space.
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