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/ˌd(y)o͞oəˈdēnəm/  /d(y)o͞oˈädn-əm/ Noun, pl. duodena or duodenums 1. The first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear, and the terms anterior intestine or proximal intestine may be used instead of duodenum. ( 2. The part of the small intestine between the stomach and the jejunum. ( 3. The first or proximal portion of the small intestine, extending from the pylorus to the jejunum, so called because it is about 12 fingerbreadths in length. ( Word origin: From Latin duodenum, from duodeni ‘twelve each’, from duodecim ‘twelve (from duo ‘two’ + decem...

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/ˈd(y)o͝orə/ Noun 1. (Anatomy) The dura mater, the outer covering of the brain and spinal cord. ( 2. Dura mater. The outermost (and toughest) of the 3 meninges. ( 3. A thin membrane that is the outermost of the three layers of the meninges that surround the brain and spinal cord. It is derived from mesoderm. ( Word Origin: Latin Fem. Of durus,...

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Dura mater

Noun The tough fibrous membrane covering the brain and the spinal cord and lining the inner surface of the skull. It is the outermost of the three meninges that surround the brain and spinal cord. ( Synonym: Dura, pachymeninges, pachymeninx Word origin: From Medieval Latin dura mater cerebri, literally “hard mother of the brain,” a loan-translation of Arabic umm al-dimagh as-safiqa, literally “thick mother of the brain.” “In Arabic, the words ‘father,’ ‘mother,’ and ‘son’ are often used to denote relationships between...

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