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weight bearing

Supporting some or all of the mass of the body on bones, muscles, and tendons, e.g., those that have been recently injured and are now being rehabilitated.

weight cycling

Rapid increases and decreases in body weight. It is colloquially called a yo-yo diet.


An indicator of a child’s growth, esp. of his or her being adequately nourished. It is used most accurately as a nutritional standard in children under 10.


(wāt′ĭng) 1. In radiation therapy that uses two opposing fields, the use of a higher dose for one of the fields. 2. In statistical or numerical analysis, the placing of emphasis on a variable or the gauging of the impact of a variable among a group of potential influences on an outcome.


The condition of not being acted on by the force of gravity. It is present when astronauts travel in areas so distant from the earth, moon, or planets that the force of gravity is virtually absent.

weight velocity

The increase in body weight of a child over a specified period of time, e.g., a month or a year.

Weil disease

(vīl) [Adolf Weil, Ger. physician, 1848–1916] Leptospirosis caused by any one of several serotypes of Leptospira interrogans such as L. icterohemorrhagica in rats, L. pomona in swine, or L. canicola in dogs. All of these may be pathogenic for humans.

 ETIOLOGY: The infection is caused by contact with infected rat urine or feces.

 SYMPTOMS: Symptoms include muscular pains, fever, jaundice, and enlargement of the liver and spleen.

 TREATMENT: Penicillins or tetracyclines are curative.

 PREVENTION: Doxycycline may be used to prevent infection in those exposed to the spirochetes.

Weil-Felix reaction, Weil-Felix test

(vīl-fā′lĭks) [Edmund Weil, Austrian bacteriologist, 1880–1922; Arthur Felix, Ger. bacteriologist, 1887–1956] The agglutination of certain Proteus organisms caused by the development of Proteus antibodies in certain rickettsial diseases.

Weill-Marchesani syndrome

(vā′mar-kĕ-zan′ē) [Georges Weill, Fr. ophthalmologist, 1866–1952; Oswald Marchesani, Ger. ophthalmologist, 1900–1952] ABBR: WMS. A connective tissue disorder marked by brachydactyly, joint stiffness, short sature, and ocular anomalies including ectopia of the lenses, glaucoma, severe microspherophakia, and myopia.

Welch bacillus

(welsh) [William Henry Welch, U.S. pathologist, 1850–1934] Clostridium perfringens, the causative organism of gas gangrene. SEE: gas gangrene.


(wĕld) [variant of well, to boil] To fuse or join two objects with heat.

well-being committee


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