Brach`y*di*ag"o*nal (?), a. [Gr.
brachy`s short + E. diagonal.] Pertaining to the
shorter diagonal, as of a rhombic prism.
Brachydiagonal axis, the shorter lateral axis of
an orthorhombic crystal.
Brach`y*di*ag"o*nal, n. The shorter of
the diagonals in a rhombic prism.