Letter S

Stenosis

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A narrowing, as in:</P> > >aortic stenosis (narrowing of the aortic valve of the heart), >pulmonary stenosis (narrowing of the pulmonary valve of the heart), >pyloric stenosis (narrowing of the outlet of the stomach), and >spinal stenosis (narrowing of the vertebral canal).</LI></UL> From the Greek 'stenos' meaning narrow.

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