Webster's New World Medical Dictionary

2
In psychology, the part of thought and
emotion that happens outside everyday awareness.
unconsciousness, temporary
A partial or com-
plete loss of consciousness; interruption of aware-
ness of oneself and one’s surroundings. When the
loss of consciousness is temporary and recovery is
spontaneous, it is referred to as syncope or, more
commonly, fainting. Temporary unconsciousness
may also occur with some types of seizures, from a
head injury, or as part of a dissociative state. See
also 
dissociation; seizure; syncope.
undulant fever
See 
Brucellosis.
unicornuate
Having one horn, or being 
horn shaped. For example, the uterus is normally
unicornuate.
unilateral
Having, or relating to, one side. For
example, a unilateral rash is one that is only on one
side of the body.
uniparous
Having one offspring in a birth. See
also 
multiparous.
unipolar depression
See 
depression.
United Network for Organ Sharing
A medical
agency in the US that coordinates organ donations,
including matching potential donors and recipients.
Abbreviated UNOS.
United States Public Health Service
The part
of the Department of Health and Human Services
(HHS) that is responsible for the public health of
the US population. Abbreviated USPHS. USPHS
administers a number of important health agencies,
including the Food and Drug Administration (FDA),
the Centers for Disease Control and Prevention
(CDC), and the National Institutes of Health (NIH).
universal colitis
See 
colitis, ulcerative.
UNOS
United Network for Organ Sharing.
unresectable
Unable to be removed (resected)
by surgery.
unsaturated fat
A fat that is liquid at room tem-
perature and comes from a plant, such as olive,
peanut, corn, cottonseed, sunflower, safflower, or
soybean oil. Unsaturated fat tends not to raise the
level of LDL (“bad”) cholesterol in the blood.
unsteadiness
Loss of one’s equilibrium in
respect to the environment, often with a feeling of
almost falling and often as a result of bumping into
something. There are many causes for unsteadiness,
including problems in the cerebral or cerebellar
portions of the brain, the spinal cord, vestibular sys-
tem, or inner ear. See also 
dizziness; lightheaded-
ness; vertigo.
upper GI series
A series of X-rays of the upper