| waters | Colloquialism for amniotic fluid. Bag of waters, bag. False waters, a leakage of fluid prior to or in beginning labour, before the rupture of the amnion. (05 Mar 2000) |
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| Waters' operation | An extraperitoneal cesarean section with a supravesical approach. (05 Mar 2000) |
| Waters' projection | A PA radiographic view of the skull made with the orbitomeatal line at an angle of 37 |
| Waters' view | A PA radiographic view of the skull made with the orbitomeatal line at an angle of 37 |
| Waters' view radiograph | A radiographic frontal view of the maxillary sinuses, orbits, nasal structures and zygomas; permits direct comparison of the sides. Synonym: Waters' view radiograph. (05 Mar 2000) |
| Waters, Charles Alexander | <person> U.S. Radiologist, 1888-1961. See: Waters' view radiograph. (05 Mar 2000) |
| Waters, Edward | <person> U.S. Obstetrician and gynecologist, *1898. See: Waters' operation. (05 Mar 2000) |
| watershed | 1. The whole region or extent of country which contributes to the supply of a river or lake. 2. The line of division between two adjacent rivers or lakes with respect to the flow of water by natural channels into them; the natural boundary of a basin. Origin: Cf. G. Wasserscheide; wasser water + scheide a place where two things separate, fr. Scheiden to separate. Source: Websters Dictionary (01 Mar 1998) |
| watershed infarction | Cortical infarction in an area where the distribution of major cerebral arteries meet or overlap. (05 Mar 2000) |
| watershoot | 1. A sprig or shoot from the root or stock of a tree. 2. That which serves to guard from falling water; a drip or dripstone. 3. A trough for discharging water. Source: Websters Dictionary (01 Mar 1998) |
| Waterston operation | A surgically created anastomosis between the pulmonary artery and the ascending aorta to palliate adult tetralogy of Fallot. (05 Mar 2000) |
| Waterston shunt | Creation of a narrow (about 3 mm) opening between the ascending aorta and the subjacent right pulmonary artery to increase pulmonary circulation in cyanotic heart disease with decreased pulmonary flow. (05 Mar 2000) |
| Waterston, David | <person> British thoracic and paediatric surgeon, *1910. See: Waterston operation, Waterston shunt. (05 Mar 2000) |
| bag of waters | The amniotic sac and amniotic fluid. (12 Dec 1998) |
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| mineral waters | Water naturally or artificially infused with mineral salts or gases (carbon dioxide). (12 Dec 1998) |
| tidal waters | Those waters that rise and fall in a predictable and measurable rhythm or cycle due to the gravitational pulls of the moon and sun. Tidal waters end where the rise and fall of the water surface can no longer by practically measured in a predictable rhythm due to masking by hydrologic, wind, or other effects. Source: 33 CFR |