noun, plural hexahedrons, hexahedra [hek-suh-hee-druh] .
a solid figure having six faces, as a cube.

1565–75; < Greek hexáedron. See hexa-, -hedron

hexahedral, adjective
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World English Dictionary
hexahedron (ˌhɛksəˈhiːdrən)
See also polyhedron a solid figure having six plane faces. A regular hexahedron (cube) has square faces

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American Heritage
Science Dictionary
hexahedron   (hěk'sə-hē'drən)  Pronunciation Key 
Plural hexahedrons or hexahedra
A polyhedron, such as a cube, that has six faces.
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