\Dec`a*he"dron\, n.; pl. E. {Decahedrons}, L.
{Decahedra}. [Pref. deca- + Gr. 'e`dra a seat, a base, fr.
'e`zesthai to sit: cf. F. d['e]ca[`e]dre.] (Geom.)
A solid figure or body inclosed by ten plane surfaces.
[Written also, less correctly, {decaedron}.]