orthodiagonal


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orthodiagonal

(ˌɔːθəʊdaɪˈæɡənəl)
n
(Chemistry) the axis in a crystal
adj
(Chemistry) relating to the axis of a crystal
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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* We recall, to finish the proof, that "for any orthodiagonal quadrilateral, the sum of the squares of two opposite sides equals that of the other two opposite sides and conversely".
so that I A'[A'.sub.1][A.sub.1] is orthodiagonal and A'[A.sub.l] [perpendicular to] I[A'.sub.1].