brachydiagonal 短軸
Brach·y·di·ag·o·nal a. 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. ◄ ►