watershed

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wa·ter·shed

(wah'tĕr-shed),
1. The area of marginal blood flow at the extreme periphery of a vascular bed.
2. Slopes in the abdominal cavity, formed by projections of the lumbar vertebrae and the pelvic brim, that determine the direction in which a free effusion gravitates when the body is supine.
Farlex Partner Medical Dictionary © Farlex 2012

wa·ter·shed

(waw'tĕr-shed)
1. The area of marginal blood flow at the extreme periphery of a vascular bed.
2. Slopes in the abdominal cavity, formed by projections of the lumbar vertebrae and the pelvic brim, which determine the direction in which a free effusion will gravitate when the body is in a supine position.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

watershed

a dividing line, such as a ridge, between two different river systems.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

wa·ter·shed

(waw'tĕr-shed)
1. Area of marginal blood flow at the extreme periphery of a vascular bed.
2. Slopes in the abdominal cavity, formed by projections of the lumbar vertebrae and the pelvic brim.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
The focus areas of the schemes is development of water sheds, improve the ground water levels, to increase area under irrigation and increase the green cover by planting more trees.
This is a chance to raise awareness about these valuable water sheds and help ensure that these fish will return year after year," said Van Havig, Rock Bottom Portland Brewmaster.