Webster's New World Medical Dictionary

oromandibular dystonia
A condition character-
ized by forceful contractions of the muscles of the
jaw, lips, and tongue. The jaw may be pulled open or
shut, and speech and swallowing can be difficult.
Local injections of botulism toxin (Brand name:
Botox) have been used as a treatment.
oropharynx
The part of the throat that is at the
back of the mouth, in contrast to the nasopharynx
(the part of the throat that is behind the nose).
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oropharynx
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orphan disease
A disease that has not been
“adopted” by the pharmaceutical industry because
it provides little financial incentive for the private
sector to make and market new medications to treat
or prevent it. An orphan disease may be a rare dis-
ease (according to US criteria, a disease that affects
fewer than 200,000 people) or a common disease
that has been ignored (such as tuberculosis,
cholera, typhoid, and malaria) because it is far
more prevalent in developing countries than in the
developed world. 
orphan drug
A drug that is designed to treat or
prevent an orphan disease. See also 
orphan disease.
ORS
Oral rehydration solution.
ORT
Oral rehydration therapy.
ortho
- Prefix meaning straight or erect, as in
orthodontics (the straightening of the teeth) and
orthostatic (in an upright posture).
orthodontic treatment
The use of devices, such
as dental braces, to move teeth or adjust underlying
bone. Teeth can be moved with removable appli-
ances or with fixed braces. 
orthodontics
The dental specialty that is con-
cerned with the diagnosis and treatment of dental
deformities as well as irregularity in the relationship
of the lower to the upper jaw.