Plural of heptahedron; multiple three-dimensional solids each containing seven faces.
Standard English plural of 'heptahedron' using '-s'. Maintains Greek roots while creating a countable form.
While cubes and pyramids dominate geometry classes, heptahedrons appear in advanced mathematics and mineralogy—there are only a handful of ways to create a valid seven-faced solid compared to infinite variations of other polyhedra!
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