(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.
Found on https://www.encyclo.co.uk/local/20501
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 . Found on http://www.encyclo.co.uk/webster/O/35