Also found in: Encyclopedia, Wikipedia.
click for a larger image


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

hep′ta·he′dral (-drəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -drons or -dra (-drə)
(Mathematics) a solid figure having seven plane faces. See also polyhedron
ˌheptaˈhedral adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Mentioned in ?
References in periodicals archive ?
Type Voronoi cells Delaunay cells (2,2,2) Polygon Edge (2,1,1) Edge Quadrangle or pentagon (1,1,1) Edge Polygon with 3 to 6 vertices (1,1,0) Vertex Polyhedron with 9 vertices (2,0,0) Vertex Hexahedron or heptahedron (1,0,0) Vertex Polyhedron with 10 or 11 vertices (0,0,0) Vertex Polyhedron with 4 to 12 vertices Type Surface patch (2,2,2) Hyperboloid (2,1,1) Hyperboloid (1,1,1) Hyperboloid (1,1,0) Sphere (2,0,0) Sphere (1,0,0) Sphere (0,0,0) Sphere TABLE 4: Performance of MSS modeling algorithms with and without GMSSTF.
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.