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zinc oxide

(Encyclopedia)zinc oxide, chemical compound, ZnO, that is nearly insoluble in water but soluble in acids or alkalies. It occurs as white hexagonal crystals or a white powder commonly known as zinc white. Zinc white...

Book of Changes

(Encyclopedia)Book of Changes or I Ching ē jĭng, ē chĭng [key], ancient Chinese book of prophecy and wisdom. The oldest parts of its text are thought to have attained their present form in the century before Co...

Benjamin of Tudela

(Encyclopedia)Benjamin of Tudela to͞odāˈlä [key], d.1173, rabbi considered the first European to approach the borders of China, b. Tudela, Spain. He traveled (1159–73) through Italy, Greece, Palestine, Persia...

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...

photon

(Encyclopedia)photon fōˈtŏn [key], the particle composing light and other forms of electromagnetic radiation, sometimes called light quantum. The photon has no charge and no mass. About the beginning of the 20th...

Paul of Samosata

(Encyclopedia)Paul of Samosata səmŏsˈətə [key], fl. 260–72, Syrian Christian theologian, heretical patriarch of Antioch. He was a friend and high official of Zenobia of Palmyra. Paul enounced a dynamic monar...

luminism

(Encyclopedia)luminism lo͞oˈmĭnĭzˌəm [key], American art movement of the 19th cent. Luminism was an outgrowth of the Hudson River school. In its concern for capturing the effects of light and atmosphere it is...

Tucker, Abraham

(Encyclopedia)Tucker, Abraham, 1705–74, English philosopher, b. London. He studied law at Merton College, Oxford, and later devoted himself to independent study. He advanced the ethical view that each man seeks h...

Nicholas of Cusa

(Encyclopedia)Nicholas of Cusa (Nicolaus Cusanus), 1401?–1464, German humanist, scientist, statesman, and philosopher, from 1448 cardinal of the Roman Catholic Church. The son of a fisherman, Nicholas was educate...

Witelo of Silesia

(Encyclopedia)Witelo of Silesia or Vitelo, c.1230–75, Silesian physicist, philosopher, and theologian. He studied in Paris and Padua and spent time at the papal palace in Viterbo, Italy. His ten-volume work on op...