Webster's New World Medical Dictionary

bronchiolitis
Inflammation of the bronchioles,
usually due to viral infections.
bronchitis
Inflammation and swelling of the
bronchi. Bronchitis can be acute or chronic.
bronchitis, acute
An infection of the bronchi of
recent origin, typically characterized by cough,
chest discomfort, and production of mucus (spu-
tum). Acute bronchitis is treated with antibiotics.
bronchitis, chronic
Inflammation and swelling
of the lining of the airways, leading to narrowing
and obstruction generally resulting in daily cough.
The inflammation stimulates production of mucus,
which can cause further blockage of the airways.
Obstruction of the airways, especially with mucus,
increases the likelihood of bacterial lung infection.
Chronic bronchitis is common in persons who have
smoked for extended periods.
bronchopulmonary dysplasia
A chronic lung
disease in infants who received mechanical respira-
tory support with high oxygenation in the neonatal
period.
bronchopulmonary segment
A subdivision of
one lobe of a lung, based on the connection to the
segmental bronchus. For example, the right upper
lobe of the lung has apical, anterior, and posterior
segments.
bronchoscope
A thin, flexible instrument with a
lighted viewing tube that is used to visualize the air
passages to the lungs.
bronchoscopy
A procedure using a broncho-
scope to diagnose and treat lung conditions and dis-
ease. See also 
bronchoscope.
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bronchospasm
A temporary narrowing of the
airways in the lung. Bronchospasm causes the
breathing difficulties seen in asthma. See also
asthma.