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adenoids

(Encyclopedia)adenoids ădˈənoidzˌ [key], common name for the pharyngeal tonsils, spongy masses of lymphoid tissue that occupy the nasopharynx, the space between the back of the nose and the throat. Normally the...

Boccioni, Umberto

(Encyclopedia)Boccioni, Umberto o͞ombĕrˈtō bŏt-chôˈnē [key], 1882–1916, Italian futurist painter and sculptor. He played a primary role in the drafting of the manifesto of futurism in 1910 and was the maj...

rancheria

(Encyclopedia)rancheria ränchāˈrēä [key], type of communal settlement formerly characteristic of the Yaqui Indians of Sonora, Mexico, and of various small Native American groups of the SW United States, especi...

Rogers, William Pierce

(Encyclopedia)Rogers, William Pierce, 1913–2001, U.S. government official, b. Norfolk, N.Y. Admitted to the bar in 1937, he served (1947–50) as chief counsel to two Senate investigating committees before becomi...

Sitter, Willem de

(Encyclopedia)Sitter, Willem de vĭlˈəm də sĭtˈər [key], 1872–1934, Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director of its observatory. His ...

peritoneum

(Encyclopedia)peritoneum pĕrətənēˈəm [key], multilayered membrane which lines the abdominal cavity, and supports and covers the organs within it. The part of the membrane that lines the abdominal cavity is ca...

Doppler effect

(Encyclopedia)Doppler effect, change in the wavelength (or frequency) of energy in the form of waves, e.g., sound or light, as a result of motion of either the source or the receiver of the waves; the effect is nam...

Magellanic Clouds

(Encyclopedia)Magellanic Clouds măjˌəlănˈĭk [key], two dwarf galaxies located in the far southern sky and visible to the unaided eye; they are classified as irregular because they show no definite symmetry or...

Bacon, Roger

(Encyclopedia)Bacon, Roger, c.1214–1294?, English scholastic philosopher and scientist, a Franciscan. He studied at Oxford as well as at the Univ. of Paris and became one of the most celebrated and zealous teache...

topology

(Encyclopedia)CE5 Möbius strip: On the ordinary flat loop (A), an ant walking along the middle of the strip will pass only around the outside of the strip. If the strip is cut along the dotted line, twisted onc...