orthodiagonal

/AO0 R TH AH0 D AY0 AE1 G AH0 N AH0 L/
adjective
  1. 1

    (mathematics, of a quadrilateral) Having diagonals that are perpendicular to each other.

noun
  1. 1

    (crystallography) The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.