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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...

Leslie, John

(Encyclopedia)Leslie or Lesley, John, 1527–96, Scottish bishop, historian, and statesman. After studying in France, he returned (c.1554) to Scotland, where he opposed the Reformation. He became ecclesiastical adv...

Seferis, George

(Encyclopedia)Seferis, George sĕfĕrˈēs [key] (Giorgos Sefiriades), 1900–1971, Greek poet. Educated at the Univ. of Paris, he returned to Greece, where he had a distinguished career as a diplomat, including se...

virtual observatory

(Encyclopedia)virtual observatory, a collection of integrated astronomical data archives and software tools that utilize computer networks to create an environment in which research can be conducted. Several countr...

Chesnutt, Charles Waddell

(Encyclopedia)Chesnutt, Charles Waddell wädĕlˈ [key], 1858–1932, American author and lawyer, b. Cleveland, Ohio. In 1887 he was admitted to the Ohio bar. His short stories were first published in the Atlantic ...

Gibran, Kahlil

(Encyclopedia)Gibran, Kahlil or Khalil kəlēlˈ jĭbränˈ [key], 1883–1931, Lebanese poet and novelist. His family emigrated to America in 1895 and settled in Boston; Gibran moved to New York City in 1911. In a...

potentiometer

(Encyclopedia)potentiometer. 1 Manually adjustable, variable, electrical resistor. It has a resistance element that is attached to the circuit by three contacts, or terminals. The ends of the resistance element are...

pyramid, in geometry

(Encyclopedia)CE5 Pyramid pyramid, in geometry, solid figure bounded by a polygon (the base, or directrix) and the surface generated by a moving line (the generator) passing through a fixed point (vertex) and c...

Paston Letters

(Encyclopedia)Paston Letters, collection of personal and business correspondence, mostly among members of the Paston family of Norfolk, England. The letters cover the years from 1422 to 1529, together with deeds an...

Humboldt, river, United States

(Encyclopedia)Humboldt, river, c.300 mi (480 km) long, rising in several branches in the mountains of NE Nev. It meanders generally west to disappear in Humboldt Sink, W Nevada. Along with its tributaries, the Humb...