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n. pl. hep·ta·he·drons or hep·ta·he·dra (-drə)
A polyhedron with seven faces.

hep′ta·he′dral (-drəl) adj.


n, pl -drons or -dra (-drə)
(Mathematics) a solid figure having seven plane faces. See also polyhedron
ˌheptaˈhedral adj
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References in periodicals archive ?
Although there are only six chapters proper in Greenvoe, Mackay Brown argues that "it was to have the heptahedron form: the seven days of the week.
3 it is concluded that heptahedron i and octahedron i offer the most promising solutions.
One such gem is Robert Starer's Heptahedron - A Statue Having Seven Faces, a work he wrote for the legendary harpsichordist Fernando Valenti.