The plural of hendecahedron; three-dimensional solids with eleven faces.
From Greek 'hendeca-' (eleven) plus 'hedra' (face or seat). This is the Greek plural form, used in mathematics and geometry.
In polyhedron naming, Greek plurals and English plurals both exist—so you'll hear scientists say 'hendecahedra' (Greek) or 'hendecahedrons' (English), reflecting how science borrows from classical languages.
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