Category: A
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Argentaffin
Denoting cells that react with silver salts, thus taking a brown or black stain.
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Argasidae
A family of soft ticks that usually infest birds but may attack humans, causing pain and fever.
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Arevareva
Severe skin disease marked by scales and general debility. Arevareva is thought to be caused by excess use of kava, an intoxicating beverage. Use of kava should be stopped.
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Areolitis
Inflammation of a mammary areola.
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Areola umbilicalis
A pigmented area surrounding the umbilicus.
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Areola mammae
The pigmented area surrounding the nipple.
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Arecoline
An alkaloid found in the betel nut that causes cholinergic (parasympathetic) toxicity when the nut is chewed. This chemical also causes periodontal disease and upper gastrointestinal tract cancer.
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Area under the curve
The integrated quantity of drug (the serum drug concentration curve) after a single dose.
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Area of rescue assistance
A safe haven near or linked to a building’s evacuation route where people escaping an emergency can rest fully protected from hazards such as fire, smoke, or heat.
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Area agency on aging
An agency that develops, coordinates, and in some cases provides a wide range of community-based services for persons aged 60 or older.