Os
The left eye (oculus sinister), as opposed to the right eye (oculus dexter).
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- OS (lens prescription)
Abbreviation of “oculus sinister.” Latin for “left eye.” By contrast, OD stands for “oculus dexter” which is Latin for the right eye.
- 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.
- OSA (obstructive sleep apnea)
Abbreviation for obstructive sleep apnea (and also for the Optical Society of America).
- 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.