Webster's New World Medical Dictionary

Brenner tumor
A tumor of the surface of the
ovary. Brenner tumors are usually benign, but in
rare cases, they are cancerous.
bridge 1
A set of one or more false teeth that is
supported by a metal framework and used to
replace one or more missing teeth.
2
A form of
treatment that serves as a transition from a previous
form of treatment and is followed with another
form, such as in “bridge therapy.”
3
Tissue that
forms an arc over adjacent tissue(s). For example,
heart tissue that has formed over a coronary artery,
sometimes physically pinching the artery, is referred
to as a myocardial bridge.
Brill-Zinsser disease
Reactivation of epidemic
typhus years after an earlier attack of the disease.
Rickettsia prowazekii, the agent that causes epi-
demic typhus, remains viable for many years. When
the host’s defenses are down, it can be reactivated.
See also 
rickettsial diseases; typhus, epidemic.
brittle bone disease
See 
osteogenesis imper-
fecta.
BRM
See 
biological response modifier.
Broca area
An area of the cerebral motor cortex
in the frontal lobe of the brain that is responsible for
speech development. Damage to the Broca area can
cause speech disorders, including aphasia, apraxia,
and dyspraxia. See also 
aphasia; apraxia of
speech; dyspraxia of speech.
Broda test
See 
basal temperature.
bronchi
The plural of bronchus.
bronchiectasis
Permanent abnormal widening
of the bronchi (air tubes that branch deep into the
lungs). Bronchiectasis can cause recurrent lung
infections, a disabling cough, shortness of breath,
and coughing up blood.
bronchiole
The tiny branch of air tubes within
the lungs that is a continuation of the bronchus. The
bronchioles connect to the alveoli (air sacs).