Orbital ridge
The bony ridge beneath the eyebrow.
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- Orchiopexy
Surgery to bring an undescended testicle down into the scrotum.
- Orchitis
Inflammation of the testis. Causes of orchitis include mumps and other infections; diseases, such as polyarteritis nodosa; and injury.
- Ordre des Medecins
The Conseil National de l’Ordre des Médecins. The French equivalent of the American Medical Association (the AMA).
- Organ
A relatively independent part of the body that carries out one or more special functions. Examples of organs include the eyes, ears, heart, lungs, and liver.
- Organ failure
The failure of an essential system in the body. Multiple organ failure is the failure of two or more systems, such as the cardiovascular, and renal systems, and is a common consequence of sepsis (the presence of bacteria in the bloods) and of shock (very low blood pressure).