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单词	heptahedron
释义	heptahedron /ˌhɛptəˈhiːdrən / noun (plural heptahedra /ˌhɛptəˈhiːdrə/ or heptahedrons) A solid figure with seven plane faces.Around the circle - in which the heptahedron lies - another seven-fold star can be constructed.... Edges vanish, and it becomes a heptahedron, having three rhombic faces and four triangular faces. While all of the faces are regular and vertices equivalent, the heptahedron is self-intersecting and is therefore not considered an Archimedean solid. Derivatives heptahedral adjective Origin Late 17th century: from hepta- 'seven' + -hedron, on the pattern of words such as polyhedron.
随便看	bacteriorhodopsin bacteriostasis bacteriostat bacteriostatic bacteriostatically bacterium bacteriuria bacterization bacterize bacteroid Bactria Bactrian Bactrian camel baculovirus baculum bacˈteriophaeophytin bad bada bing bad actor badam Badarian badass bad-assed badassery bad ball

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