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pentimento

(Encyclopedia)pentimento pĕnˌtəmĕnˈtō [key], painter's term for the evidence in a work that the original composition has been changed. Often the opaque pigment with which the artist covered a mistake or unwan...

health-care proxy

(Encyclopedia)health-care proxy, legal document in which a person assigns to another person, usually called an agent or proxy, the authority to make medical decisions in case of incapacitation. It is, in essence, a...

Sophia Dorothea

(Encyclopedia)Sophia Dorothea sōfīˈə dŏrəthēˈə [key], 1666–1726, electress of Hanover, wife of Elector George Louis (later King George I of England); sometimes called Sophia Dorothea of Celle. Married to...

diffusion

(Encyclopedia)diffusion, in chemistry, the spontaneous migration of substances from regions where their concentration is high to regions where their concentration is low. Diffusion is important in many life process...

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...

Halifax, George Savile, 1st marquess of

(Encyclopedia)Halifax, George Savile, 1st marquess of, 1633–95, English statesman. A protégé of the 2d duke of Buckingham, he was made Viscount Halifax (1668) and sat (1672–76) in the privy council. An oppone...

Smithsonian Institution

(Encyclopedia)Smithsonian Institution, research and education center, mainly at Washington, D.C.; founded 1846 under the terms of the will of James Smithson of London, who in 1829 bequeathed his fortune to the Unit...

Antichrist

(Encyclopedia)Antichrist ănˈtĭkrīst [key], in Christian belief, a person who will represent on earth the powers of evil by opposing the Christ, glorifying himself, and causing many to leave the faith. He will b...

Obadiah, book of the Bible

(Encyclopedia)Obadiah, short prophetic book of the Bible. The prophet is otherwise unknown. The oracle which comprises this book dates from after the destruction of Jerusalem by the Babylonians in 586 b.c. The prop...

extradition

(Encyclopedia)extradition ĕkstrədĭshˈən [key], delivery of a person, suspected or convicted of a crime, by the state where he has taken refuge to the state that asserts jurisdiction over him. Its purpose is to...