American Heritage® Dictionary of the English Language, Fourth Edition
- n. The terminal portion of the small intestine extending from the jejunum to the cecum.
Century Dictionary and Cyclopedia
- n. In anatomy, the lower one of three parts into which the small intestine is divisible, continuous with the jejunum and ending in the large intestine: more fully called intestinum ileum, from its many coils or convolutions. In man the ileum is taken to be the terminal three fifths of the small intestine, though its beginning is indistinguishable from the ending of the jejunum; but it ends abruptly at the cæcum, or commencement of the colon. The ileum has on an average a smaller diameter than the preceding part of the intestine, and its coats are thinner and less vascular. It lies chiefly in the umbilical, hypogastric, and right iliac regions of the abdomen. In many animals, especially those which lack a cæcum or cæca, no ileum is certainly distinguishable either from preceding or succeeding portions of the intestine; but whenever the beginning of a colon can be determined, a preceding portion of the intestinal tract, of however indefinite extent, is regarded as an ileum. See cuts under
- n. Hence, in general, the lower part, of indeterminate extent, of the small intestine; or, when there is no distinction between large and small intestine, a part of the intestine preceding the cæcum or the cæca.
- n. In entomology, a narrow part of the intestine of an insect, generally adjoining the ventriculus or stomach, and divided from the broader colon or second intestine by a constriction or valve. The ileum may be long and convoluted or straight and short; in the Hemiptera and some Neuroptera it is entirely wanting.
- n. anatomy The last, and usually the longest, division of the small intestine; the part between the jejunum and large intestine.
GNU Webster's 1913
- n. (Anat.) The last, and usually the longest, division of the small intestine; the part between the jejunum and large intestine.
- n. (Anat.), rare See Ilium.
- n. the part of the small intestine between the jejunum and the cecum
- Late Latin īleum, groin, flank, variant of Latin īlia. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The ileum is shorter, there is no sacculus rotundus, and the large intestine has no caecum, none of the characteristic sacculations of the rabbit's colon, and does not loop back to the stomach before the rectum section commences.”
“The ileum is the lower part of the small intestine.”
“Okay - the Crohn's was affecting my terminal ileum, that is where the small intestine meets the large intestine.”
“Again, the muscle cuts, where there is virtually no risk of BSE, the materials, the brain, spinal cord, distal ileum, which is where the BSE agent resides, those materials did not enter the food supply.”
“The ileal interposition procedure involves relocating a short portion of the small intestine known as the ileum further forward in the intestinal tract.”
“Any part of the digestive tract can be affected by Crohn's disease, but most often it affects the ileum, which is part of the small intestine.”
“Diverted enzymes join the ingested food only in the distal small intestine, otherwise known as the ileum”
“Next in the list is the 'ileum'; but it is difficult to say where the jejunum terminates and the ileum commences, except that the latter is usually one-fifth longer than the former.”
“While his detractors were explaining that “the most striking and consistent endoscopic feature, lymphoid nodular hyperplasia in the terminal ileum, is not unusual in children,” Wakefield was trotting out what had become a standard response of vaccine denialists to accusations of unreliable or inaccurate data: He condemned his critics for caring more about their standing in the scientific community than about sick children.”
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