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Heck, Richard Fred

(Encyclopedia)Heck, Richard Fred, 1931–2015, American chemist, b. Springfield, Mass., Ph.D. Univ. of California, Los Angeles, 1954. Heck was a researcher at the Hercules Corporation in Wilmington, Del., from 1957...

Stephen II

(Encyclopedia)Stephen II, d. 757, pope (752–57), successor of Pope St. Zacharias. When Rome was threatened by the Lombard king Aistulf, Stephen went to Gaul and appealed to Pepin the Short for help. He became the...

silicone

(Encyclopedia)silicone, polymer in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH3, are bound to the silicon atoms. Silicones, which are unusually sta...

bull mastiff

(Encyclopedia)bull mastiff măstˈĭf [key], breed of powerful working dog developed in England in the second half of the 19th cent. It stands from 24 to 27 in. (61–68.6 cm) high at the shoulder and weighs from 1...

Weil, Simone

(Encyclopedia)Weil, Simone sēmônˈ vīl [key], 1909–43, French philosopher and mystic. After receiving her baccalauréat with honors at 15, she studied philosophy for four years, then entered (1928) the prestig...

meditation

(Encyclopedia)meditation, religious discipline in which the mind is focused on a single point of reference. It may be a means of invoking divine grace, as in the contemplation by Christian mystics of a spiritual th...

Kouchner, Bernard

(Encyclopedia)Kouchner, Bernard bârnärˈ ko͞oshnârˈ [key], 1939–, French physician, diplomat, and politician. A gastroenterologist by training, he earned his medical degree in France in the late 1960s. He pr...

transept

(Encyclopedia)transept trănˈsĕptˌ [key], term applied to the transverse portion of a building cutting its main axis at right angles or to each arm of such a portion. Transepts are found chiefly in churches, whe...

Gaddi, family of Florentine artists

(Encyclopedia)Gaddi gädˈdē [key], celebrated family of Florentine artists. Gaddo Gaddi, c.1260–c.1333, painter and mosaicist, is said by Vasari to have been associated with Cimabue and Giotto. Among the mosaic...

John, three epistles of the New Testament

(Encyclopedia)John, three letters of the New Testament. Traditionally, they are ascribed to John son of Zebedee, the disciple of Jesus. All three letters probably date to the end of the 1st cent. a.d., and may have...