† di-tetraˈhedral, a. Cryst. Obs.
[f. di-2 1 + tetrahedral.]
Having the form of a tetrahedral prism with dihedral summits.
| 1805–17 R. Jameson Char. Min. (ed. 3) 203 It represents a four-sided prism, bevelled on the extremities. Example, Di-tetrahedral tremolite. |