wa·ter·shed (wô t r-sh d )n. 1. A ridge between two areas that directs drainage to either side. 2. The area of marginal blood flow at the extreme periphery of a vascular bed. 3. Ridges of the lumbar vertebrae and the pelvic brim formed in the abdominal cavity, which determine the direction in which a free effusion will gravitate when the body is supine. |
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