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The terminal part of the large intestine; -- so named because supposed by the old anatomists to be straight. See Illust. under Digestive.

The line drawn through a focus of a conic section parallel to the directrix and terminated both ways by the curve. It is the parameter of the principal axis. See Focus, and Parameter.

The fold of peritoneum, or mesentery, attached to the rectum. -- Mes`o*rec"tal, a.

An herbaceous plant (Trillium erectum), and its astringent rootstock, which is said to have medicinal properties.

That part of the large intestines which extends from the cæcum to the rectum.

A disease attended with inflammation and ulceration of the colon and rectum, and characterized by griping pains, constant desire to evacuate the bowels, and the discharge of mucus and blood.

An instrument for examining the interior of the rectum, the urethra, and the bladder.

An injection, or clyster, thrown into the rectum as a medicine, or to impart nourishment. Hoblyn.

Of or pertaining to the rectum; rectal; as, the hemorrhoidal arteries, veins, and nerves.

The posterior part of the alimentary canal, including the rectum, and sometimes the large intestine also.

ss convoluted than the small intestine; it consists of three parts, the cæcum, colon, and rectum. -- Small intestine (Human Anat. & Med.), the upper portion of the bowel, in which the process of digestion is practically completed. It is narrow and contorted, and consists of three parts, the duodenum, jejunum, and ileu…

Of or pertaining to the region between the rectum and ishial tuberosity.

cted with the jejunum and ilium, the other mesenteries being called mesoc, mesocolon, mesorectum, etc.

luded within the outlet of the pelvis, and is traversed by the urinogenital canal and the rectum.

Inflammation of the tissues about the rectum.

The small, troublesome tumors or swellings about the anus and lower part of the rectum which are technically called hemorrhoids. See Hemorrhoids.

A small nematoid worm (Oxyurus vermicularis), which is parasitic chiefly in the rectum of man. It is most common in children and aged persons.

Inflammation of the rectum.

Inversion and prolapse of the mucous coat of the rectum, from relaxation of the sphincter, with more or less swelling; prolapsus ani. Dunglison.

An incision into the rectum, as for the division of a stricture.