The Collaborative International Dictionary
Macrodiagonal
Macrodiagonal \Mac`ro*di*ag"o*nal\, n. [Macro- + diagonal.] (Crystallog.) The longer of two diagonals, as of a rhombic prism. See Crystallization.
Wiktionary
macrodiagonal
n. The longer of two diagonals, as of a rhombic prism. See crystallization.