Category: Rf-Rz

A street name given to cocaine that has been processed from cocaine hydrochloride to a ready-to-use free base for smoking. Rather than requiring the more volatile method of processing cocaine using ether, rock cocaine (also called crack) is processed with ammonia or sodium bicarbonate (baking soda) and water and heated to remove the hydrochloride, thus producing a form of cocaine that can…

In statistics, a term applied to a test or procedure that is not seriously disturbed by violations of the assumptions on which it is based. For example, it was an “unexpected and robust difference in the rate of events.” (Dr. Harold J. Burstein, in The New England Journal of Medicine, Oct 9, 2003)

A virus in which the genetic material is RNA. The RNA may be either double- or single-stranded. There are 6 classes of viruses. The DNA viruses constitute classes I and II. The RNA viruses make up the remaining classes. Class III viruses have a double-stranded RNA genome. Class IV viruses have a positive single-stranded RNA genome,…

Ribonucleic acid.

Right middle lobe, the middle-right lobe of the lung.

Right lower quadrant, the lower-right quarter of the abdomen.

Right lower lobe, the lower-right lobe of the lung.

Something that increases a person’s chances of developing a disease. For example, cigarette smoking is a risk factor for lung cancer, and obesity is a risk factor for heart disease.

Retrograde intrarenal surgery (RIRS) is a procedure for doing surgery within the kidney using a viewing tube called a fiberoptic endoscope. In RIRS the scope is placed through the urethra (the urinary opening) into the bladder and then through the ureter into the urine-collecting part of the kidney. The scope thus is moved retrograde (up the urinary tract system) to within the kidney (intrarenal).…

Ringworm is a fungal infection of the skin previously thought to be due to a parasite (worm). The medical term for ringworm is tinea. The skin infections are sometimes characterized by round lesions in the upper layers of the skin. Fungi that cause ringworm are known as dermatophytes.