Macrodiagonal n. : The longer of two diagonals, as of a rhombic prism. See Crystallization.

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Defination from the web:
macrodiagonal. The longer of two diagonals, as of a rhombic prism. See crystallization. Part or all of this page has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. ...