Arginine: An essential amino acid and a key component of protein. Lack of arginine in the diet impairs growth, and in adult males it decreases the sperm count. Arginine is available in turkey, chicken, and other meats, and as L-arginine in supplements. Babies born without the enzyme phosphate synthetase have arginine deficiency syndrome; adding arginine to their diets permits normal growth and development.
- Argon laser
Argon laser: A laser with ionized argon as the active medium. Argon lasers are used for photocoagulation in ophthalmology.
Argyria: Silver poisoning, resulting in ashen, gray, discolored skin, and damage to other tissues of the body. Caused by long-term use of silver salts or other preparations containing silver.
Arhythmia: We do not usually give a misspelling but this is a frequent misspelling of arrhythmia (with two r’s), meaning an abnormal heart rhythm. In an arrhythmia the heartbeats may be too slow, too rapid, too irregular, or too early. Rapid arrhythmias (greater than 100 beats per minute) are called tachycardias. Slow arrhythmias (slower than […]
Arimidex: Brand name for anastrozole, an oral antiestrogen. Arimidex inhibits the enzyme aromatase in the adrenal glands that produces the estrogens (estradiol and estrone) and thereby lowers their levels. It works by decreasing the amount of estrogen the body makes. This can slow or stop the growth of many types of breast cancer cells that […]
- Aristolochia fangchi
Aristolochia fangchi: A Chinese herb that is injurious to the kidney and is also associated with an increased risk of cancer of the urinary system. Aristolochia can cause kidney failure requiring renal dialysis or a kidney transplant. The tumors reported have included urothelial carcinoma, carcinoma of the ureter, renal pelvis, or both and papillary bladder […]