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Tombaugh, Clyde William

(Encyclopedia)Tombaugh, Clyde William tŏmˈbô [key], 1906–97, American astronomer, b. Streator, Ill. Although lacking formal training or a college degree, he was hired in 1929 as an assistant by the Lowell Obse...

umbilical cord

(Encyclopedia)umbilical cord ŭmbĭlˈĭkəl [key], cordlike structure about 22 in. (56 cm) long in the pregnant human female, extending from the abdominal wall of the fetus to the placenta. Its chief function is t...

Robert II, king of Scotland

(Encyclopedia)Robert II, 1316–90, king of Scotland (1371–90), nephew and successor of David II. He was the first sovereign of the house of Stuart, or Stewart (see Stuart, family), which eventually succeeded to ...

ovary

(Encyclopedia)ovary, ductless gland of the female in which the ova (female reproductive cells) are produced. In vertebrate animals the ovary also secretes the sex hormones estrogen and progesterone, which control t...

Van Vechten, Carl

(Encyclopedia)Van Vechten, Carl văn vĕkˈtən [key], 1880–1964, American music critic, novelist, and photographer, b. Cedar Rapids, Iowa, grad. Univ. of Chicago, 1903. While he was a leading music and dance cri...

Székely

(Encyclopedia)Székely sāˈkəlē [key], ethnic group of Transylvania and of present-day Romania. Except in a few isolated communities, where the ancient customs of the Székely have survived, there is little diff...

Agent Orange

(Encyclopedia)Agent Orange, herbicide used by U.S. forces during the Vietnam War to expose enemy guerrilla forces in forested areas. Agent Orange contains varying amounts of dioxin. Exposure to the defoliant has be...

Breton literature

(Encyclopedia)Breton literature brĕtˈən [key], in the Celtic language of Brittany. Although there are numerous allusions in other literatures of the 12th to 14th cent. to the “matter of Brittany,” which incl...

Besant, Annie

(Encyclopedia)Besant, Annie bĕzˈant [key], 1847–1933, English social reformer and theosophist, b. Annie Wood. She steadily grew away from Christianity and in 1873 separated from her husband, a Protestant clergy...

spectrum

(Encyclopedia)CE5 Dispersion of white light by a triangular prism spectrum, arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other propert...