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ether, in physics and astronomy

(Encyclopedia)ether or aether, in physics and astronomy, a hypothetical medium for transmitting light and heat (radiation), filling all unoccupied space; it is also called luminiferous ether. In Newtonian physics a...

Launcelot, Sir

(Encyclopedia)Launcelot, Sir lănˈsəlŏtˌ, lŏnˈ–, lônˈ– [key], in Arthurian legend, bravest and most celebrated knight at the court of King Arthur. He was kidnapped as an infant by the mysterious Lady of...

Mordred, Sir

(Encyclopedia)Mordred, Sir: see Arthurian legend. ...

Modred, Sir

(Encyclopedia)Modred, Sir: see Arthurian legend. ...

Gawain, Sir

(Encyclopedia)Gawain, Sir gäˈwān, –wĭn [key], one of the most popular heroes of Arthurian legend; nephew of King Arthur. He was regarded, particularly in the early romances, as the model of chivalry—pure, b...

Galahad, Sir

(Encyclopedia)Galahad, Sir gălˈəhădˌ [key], hero of Arthurian legend. He was the son of Launcelot and Elaine, the daughter of King Pelles. Because he was the noblest and purest of the knights of Christendom, h...

Pelleas, Sir

(Encyclopedia)Pelleas, Sir: see Arthurian legend. ...

Percivale, Sir

(Encyclopedia)Percivale, Sir: see Arthurian legend and Parsifal. ...

San Francisco Symphony

(Encyclopedia)San Francisco Symphony, orchestra founded 1911. It has performed at the Louise M. Davies Symphony Hall since 1980. Henry Hadley, the original music director, was followed by Alfred Hertz (1915–30), ...

Book of the Dead

(Encyclopedia)Book of the Dead, term used to describe Egyptian funerary literature. The texts consist of charms, spells, and formulas for use by the deceased in the afterworld and contain many of the basic ideas of...