Webster's New World Medical Dictionary

OS
The left eye (oculus sinister), as opposed to
the right eye (oculus dexter).
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 per-
mit easier childbearing.
Osgood
-
Schlatter disease
An inflammation of
the patellar tendon and surrounding soft tissues at
the point where the tendon attaches to the tibia in
children. Osgood-Schlatter disease is caused by
repetitive stress or tension on a part of the growth
area of the upper tibia (the apophysis). The disease
may also be associated with an avulsion injury, in
which the tendon is stretched so much that it tears
away from the tibia and takes a fragment of bone
with it. Osgood-Schlatter disease most commonly
affects active young people, particularly boys
between the ages of 10 and 15, who play games or
sports that include frequent running and jumping.
Treatment includes rest, casting if necessary, and
rarely surgery. See also 
osteochondrosis.
OSHA
Occupational Safety and Health
Administration.
Osler node
A small, tender, transient nodule that
develops in the pads of fingers and toes and on the
palms and soles. Osler nodes are a highly diagnos-
tic sign of bacterial infection of the heart (subacute
bacterial endocarditis).
Osler
-
Rendu
-
Weber syndrome
See 
hereditary
hemorrhagic telangectasia.
orphan disease
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osmolarity
The concentration of osmotically
active particles in solution, which may be quantita-
tively expressed in osmoles of solute per liter of
solution.