Bronchus
Bronchus: A large air tube that begins at the end of the trachea and branches into the lungs. The supporting walls of the bronchus are made up in part of cartilage.
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Brontophobia: An abnormal and persistent fear of thunder that causes undue anxiety even though sufferers realize that thunder itself poses no threat to them. When outdoors during a thunderstorm, they may suffer excessive anxiety. When indoors, they may hide under beds or desks, behind sofas, or in closets. “Brontophobia” is derived from the Greek “bronte” […]
- Brown fat
Brown fat: Brown adipose tissue, a rapid source of energy for infants in whom it forms about 5% of their body weight. It is brown because the cells in it are packed full of small cellular organs called mitochondria, which are energy factories, and it has a rich supply of blood vessels. Brown fat was […]
- Bross, Irwin DJ
Bross, Irwin DJ: (1921-2004) American public-health advocate and biostatistician who initiated and designed methods for analysing vehicle crash injury cause and effect, and conducted clinical studies of the relation between low-level radiation exposure and cancer.
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Brown syndrome: An ophthalmology (eye) problem. Brown syndrome is an abnormality that is present at birth (congenitally) and is characterized by an inability to elevate the eyeball when trying to move the eyeball to the outside. Brown syndrome can also occur because of other conditions which affect the normal function of the eye muscles. The […]
- Brown, Louise
Brown, Louise: The world’s first test-tube baby, conceived by in vitro fertilization and born on July 25, 1978.