Os sacrum
The large, heavy bone at the base of the spine. The os sacrum is symmetrical and roughly triangular in shape. The female sacrum is wider and less curved than the male sacrum, to permit easier childbearing.
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Abbreviation for obstructive sleep apnea (and also for the Optical Society of America).
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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 […]