Webster's New World Medical Dictionary

oximetry catheter
See 
catheter, oximetry.
oxygen
The odorless gas that is present in the air
and necessary to maintain life. Oxygen may be given
in a medical setting, either to reduce the volume of
other gases in the blood or as a vehicle for deliver-
ing anesthetics in gas form. It can be delivered via
nasal tubes, an oxygen mask, or an oxygen tent.
Patients with lung disease or damage may need to
use portable oxygen devices on a temporary or per-
manent basis.
oxygen chamber, hyperbaric
See 
hyperbaric
oxygen chamber.
oxygen mask
A mask that covers the mouth and
nose and is hooked up to an oxygen tank. It delivers
oxygen directly to the patient.
oxygen tent
A tent-like device that is used in a
medical setting to deliver high levels of oxygen to a
bedridden patient. The tent covers the entire head
and upper body, and oxygen is pumped in from a
tank.
oxygenation 1
The process of treating a patient
with oxygen.
2
The process of combining a med-
ication or another substance with oxygen.
oxymetholone
A synthetic male steroid hor-
mone that is sometimes used to treat wasting in
patients with HIV disease. Since it promotes large
gains in body mass, it has sometimes been used ille-
gally by bodybuilders and athletes. It has also been
used in the treatment of anemia. 
ovarian teratoma
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oxytocin
A hormone made in the brain that plays
a role in childbirth and lactation by causing muscles
to contract in the uterus and in the mammary
glands. Oxytocin is secreted by the hypothalamus
and transported to the posterior lobe of the pituitary
gland at the base of the brain. See also 
pituitary,
posterior.