Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «R»:
Recommended Daily Allowance
Recommended Daily Allowance: Popular name for the Recommended Dietary Allowance (RDA)....
Recommended Dietary Allowance
Recommended Dietary Allowance: The RDA, the estimated amount of a nutrient (or calories) per day considered necessary for the maintenance of good health by the Food and Nutrition Board of the National Research Council/ National Academy of Sciences. The RDA is updated periodically to reflect new know...
Recreational water illness
Recreational water illness: An illness that is spread by swallowing, breathing, or having contact with contaminated water from swimming pools, spas, hot tubs, decorative water fountains, lakes, rivers, or oceans. Recreational water illnesses (RWIs) can cause a wide variety of symptoms, including sk...
Recrudescence: Reappearance of a disease after it has been quiescent. A new outbreak or the return of a disease. As, for example, the recrudescence of a pansinusitis (sinusitis, an infection involving all of the sinuses).
The original meaning of "recrudence" was to become raw or sore again. It cam...
Rectal (adjective): Having to do with the
rectum, the last 6 to 8 inches of the large intestine that serves to
store solid waste until it leaves the body through the anus.
The word "rectal" comes from the Latin "rectus" meaning "straight"
(which the human rectum is not)....
Rectal (noun): An informal term for a digital rectal exam (DRE) done to detect abnormalities that can be felt (palpated) from within the rectum. The doctor inserts a lubricated, gloved finger into the rectum and feels for anything that is not normal.
The digital rectal exam is an important screeni...
Rectal bleeding: Blood passed rectally. Blood in the stool can be bright red or maroon in color. Larger amounts of blood that remain in the intestine long enough can turn the stool black. Blood in the stool also may be invisible to the naked eye (occult).
The causes of blood in the stool range fro...
Rectal cancer: A malignant tumor arising from the inner
wall of the final part of the large intestine -- the rectum. Although colon cancer and rectal cancer share many features, there are important differences between these two diseases including, especially, the tendency for rectal cancer -- but no...
Rectal exam, digital (DRE)
Rectal exam, digital (DRE): An exam done to detect abnormalities that can be felt (palpated) from within the rectum. The doctor inserts a lubricated, gloved finger into the rectum and feels for anything that is not normal.
The digital rectal exam is an important screening test for the detection of t...
Rectal incontinence: Inability to hold feces in the
rectum due to failure of voluntary control over the anal sphincters with involuntary passage of feces and gas. Also called fecal incontinence. ...
Rectal itching: See Anal itching....
Rectocele: Bulging of the front wall of the rectum into the vagina. Rectocele is due to weakening of the pelvic support structures and thinning of the rectovaginal septum (the tissues separating the rectum from the vagina). Also called a proctocele.
Risk factors for a rectocele include a history of...
Rectouterine pouch: An extension of the peritoneal cavity between the rectum and back wall of the uterus.
The term "cul-de-sac," aside from being any "blind pouch or cavity that is closed at one end," is used specifically to refer to the rectouterine pouch. From that fact comes:
Culdoscopy, the in...
Rectum: The last 6 to 8 inches of the large intestine. The rectum stores solid waste until it leaves the body through the anus. The word rectum comes from
the Latin rectus meaning straight (which the human rectum is not)....
Rectus: Usually refers to the rectus abdominis, a large muscle in the front of the abdomen that assists in the regular breathing movement and supports the muscles of the spine while lifting and keeping abdominal organs such as the intestines in place. The rectus abdominis plays a key role in "sit-up...