orthorhombic

adjective Crystallography.

1. noting or pertaining to a system of crystallization characterized by three unequal axes intersecting at right angles; rhombic; trimetric.

adjective

1. crystallog relating to the crystal system characterized by three mutually perpendicular unequal axesAlso: rhombic, trimetric

1. Relating to a crystal having three axes of different lengths intersecting at right angles. The mineral topaz has orthorhombic crystals. See illustration at crystal.