Dec′a‐he″dron (?), n.; pl. E. Decahedrons (#), L. Decahedra (#). [Pref. deca- + Gr. ἔδρα a seat, a base, fr. ἔζεσθαι to sit: cf. F. décaèdre.] (Geom.) A solid figure or body inclosed by ten plane surfaces. [Written also, less correctly, decaedron.]
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.