Rhomboid in shape, 5 to 10 cm long and 4 to 7 cm wide.
Aspiration of the joint fluid reveals rhomboid-shaped crystals under a microscope.
A second related gene - rhomboid family 1 (RHBDF1) - appears to be important in head and neck cancer.
The rhomboid wrasse, Cirrhilabrus rhomboidalis, is a species of wrasse endemic to the Marshall Islands, where it is only known from Kwajalein Atoll.