1) Rhombic 2) Trimetric 
• (a.) Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization.
A crystal system with three axes of unequal length, each perpendicular to the plane of the other two axes.
Or`tho·rhom'bic adjective [ Ortho- + rhombic .] (Crystallog.) Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization . 
Orthorhombic refers to a rectangular crystal with three axes of different lengths and all at right angles to each other. A closed book is a basic example.
orthorhombic 1. Of or relating to a crystalline structure of three mutually perpendicular axes of different lengths. 2. A description of a crystal system that has three axes of different lengths that cross at right angles.
(see crystal systems) Crystals that form in the orthorhombic system have 3 perpendicular two fold axes of symmetry. 3 reference axes at right angles but differing lengths.
noting or pertaining to a system of crystallization characterized by three unequal axes intersecting at right angles; rhombic; trimetric.