from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to a crystalline structure of three mutually perpendicular axes of different length.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. having three unequal axes at right angles
from the GNU version of the Collaborative International Dictionary of English
- adj. Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See crystallization.
from The Century Dictionary and Cyclopedia
- Rectangular and rhombic.
- In crystallography, noting the system of crystallography which is characterized by three unequal axes intersecting at right angles; belonging to this system: as, sulphur is orthorhombic. Also called trimetric. See crystallography.
ortho- + rhombic (Wiktionary)