n.; pl. E. Decahedrons L. Decahedra [ Pref. deca- + Gr. 'e`dra a seat, a base, fr. 'e`zesqai to sit: cf. F. décaèdre. ] (Geom.) A solid figure or body inclosed by ten plane surfaces. [ Written also, less correctly, decaedron. ] [ 1913 Webster ]
n. [ Gr. &unr_;; &unr_; twelve + &unr_; seat, bottom, base: cf. F. dodécaèdre. ] (Geom. & Crystallog.) A solid having twelve faces. [ 1913 Webster ]
☞ The regular dodecahedron is bounded by twelve equal and regular pentagons; the pyritohedron (see Pyritohedron) is related to it; the rhombic dodecahedron is bounded by twelve equal rhombic faces. [ 1913 Webster ]
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