Webster's New World Medical Dictionary

ulcer bug
See 
Helicobacter pylori.
ulceration
The process or fact of being eroded
away, as by an ulcer.
ulcerative colitis
See 
colitis, ulcerative.
ulcerative gingivitis
See 
acute membranous
gingivitis.
ulcerative proctitis
Ulcerative colitis that is lim-
ited to the rectum. See also 
colitis, ulcerative.
ulcerative stomatitis
See 
acute membranous
gingivitis.
ulna
The larger of the two long bones within the
forearm. (The smaller one is the radius.) The ulna
is on the same side of the arm as the little finger.
ulnar
Pertaining to the ulna, the larger bone in
the forearm.
ulnar nerve
A major nerve in the upper extrem-
ity that supplies both sensory and motor innervation
to parts of the forearm and hand.
ultrasonic-assisted liposuction
See 
liposuc-
tion, ultrasonic-assisted.
ultrasound
High-frequency sound waves. Ultra-
sound waves can be bounced off tissues by using
special devices. The echoes are then converted into
a picture called a sonogram. Ultrasound imaging
allows an inside view of soft tissues and body 
cavities without the use of invasive techniques.
Ultrasound is often used to examine a fetus during
pregnancy. There is no evidence that any danger
occurs from ultrasound during pregnancy.
ultrasound, transvaginal
See 
transvaginal
ultrasound.
ultraviolet A
See 
ultraviolet radiation.
ultraviolet B
See 
ultraviolet radiation.
Uu
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