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  1. (pl. cingula) A curved bundle of nerve fibers in each cerebral hemisphere, which nearly encircles its connection with the corpus callosum. The cingulum is a part of the brain concerned with anger and depression. The surgical removal of the cingulum, a procedure known as cingulectomy, has occasionally been carried out in some cases of intractable mental illness.

  2. A small protuberance on the lingual surface of the crowns of incisor and canine teeth.

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