dyakis-dodecahedron Cryst.
(ˈdaɪəkɪsˌdəʊdɪkəˈhiːdrən)
[f. Gr. δυάκις twice, f. δύο two + dodecahedron.]
A crystalline form contained by twenty-four trapezoidal planes having two sides equal; = diplohedron, diploid.
| 1881 H. Bauerman Textbk. Syst. Min. 54 The same relation holds good with its hemihedral form, the dyakisdodecahedron which under similar conditions passes into a pentagonal dodecahedron. 1883 M. F. Heddle in Encycl. Brit. XVI. 355 The dyakisdodecahedron..has twelve short, twelve long, and twenty-four intermediate edges. |