Webster's Revised Unabridged Dictionary · 1913

Decahedron

Decahedron (dek`ȧ*hē"dron) , noun

[Prefix deca- + Greek 'e`dra a seat, a base, from 'e`zesqai to sit: compare French décaèdre.]

(Geometry) A solid figure or body inclosed by ten plane surfaces.