OSA (obstructive sleep apnea)
Abbreviation for obstructive sleep apnea (and also for the Optical Society of America).
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- Oscillopsia
Oscillating vision. Swinging vision. In oscillopsia, objects seem to swing, move back and forth, jerk, or wiggle. A classical language hybrid derived from the Latin oscillo, to swing, + the Greek opsis, vision.
- Oscitation
The act of yawning, the involuntary opening of the mouth with respiration, breathing first inward, then outward. Yawning is often caused by suggestion. Repeated yawning is commonly a sign of drowsiness. It can also sometimes be a sign of depression.
- OSHA
The Occupational Safety and Health Administration, an agency of the US government under the Department of Labor with the responsibility of ensuring safety at work and a healthful work environment. OSHA’s mission is to prevent work-related injuries, illnesses and deaths. Since OSHA was created in 1971, occupational deaths in the US have declined by half […]
- Osgood-Schlatter disease
A condition involving inflammation and sometimes tearing of ligaments within the knee and lower leg. Treatment is by rest, casting if necessary, and sometimes surgery. Osgood-Schlatter disease is caused by repetitive stress or tension on a part of the growth area of the upper tibia (the apophysis). It is characterized by inflammation of the patellar […]
- Osler's nodes
These are small (the size of split peas), tender, transient nodules in the pads of fingers and toes and the palms and soles. They are a highly diagnostic sign of bacterial infection of the heart (subacute bacterial endocarditis). Named for the Canadian-born physician Sir William Osler (1849-1919).