Category: B
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Black membrane
An artificially constructed membrane artificially constructed membrane made of lipids arranged in a bilayer.
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Black box warning
A written advisory supplied by a pharmaceutical company to health care professionals whenever a medication causes any serious side effects). Under U.S. federal regulations, this advisory is mandatory and must be highlighted by “a prominently displayed box.”
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Black
Devoid of color or reflecting no light.
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Bjerrum’s sign
A sickle- or comet-shaped blind spot usually found in the central zone of the visual field; seen in glaucoma.
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Bjerrum’s screen
A 1-m square planar surface viewed from a distance of 1 m and consisting of a large square of black cloth with a central mark for fixation. It is used to plot the physiological blind spot, the central and paracentral scotomate, and other visual field defects.
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Bizygomatic
To the most prominent point on each of the two zygomatic arches.
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Bixel
A beam element or ray in radiation oncology.
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Bitter melon
A bitter-tasting tropical vegetable (Momordica charantia) popular in Asian countries, also known as balsam apple, balsam pear, bitter gourd, cerasee, karela, ku gua, and squirting cucumber. It is promoted in complementary and alternative medicine for its effects on diabetes melhtus, HIV infection, and obesity.
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Bitrochanteric
To both greater trochanters of the two femurs.
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Bitelock
A device used in dentistry for retaining bite rims outside the mouth in the same position as they were inside the mouth.