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sandstorm

(Encyclopedia)sandstorm, strong dry wind blowing over the desert that raises and carries along clouds of sand or dust often so dense as to obscure the sun and reduce visibility almost to zero; also known as a dusts...

‘Oumuamua

(Encyclopedia)‘Oumuamua ōmo͞oˈəmo͞oˈə [key], officially 1I/2017 U1 (‘Oumuamua), interstellar object, the first to be discovered in the solar system. Highly variable in brightness, it also is highly and u...

de Candolle, Augustin Pyrame

(Encyclopedia)de Candolle, Augustin Pyrame də käNdōlˈ [key], 1778–1841, Swiss botanist. Considered the most important Swiss botanist of his era, de Candolle wrote on a wide variety of botanical topics, from m...

Austin, John Langshaw

(Encyclopedia)Austin, John Langshaw, 1911–60, British philosopher. A graduate of Oxford, he was a fellow of All Souls (1933–35) and Magdalen (1935–52) colleges before he became White's professor of moral phil...

Santos-Dumont, Alberto

(Encyclopedia)Santos-Dumont, Alberto älbĕrˈto͝o sänˈto͝ozh-dümôNˈ [key], 1873–1932, Brazilian aeronaut. The son of a wealthy coffee grower, he was a flamboyant bon vivant and lived in France from 1891 t...

boulder, in geology

(Encyclopedia)boulder, large rock fragment formed by detachment from its parent consolidated rock by weathering and erosion. In engineering and geology, especially in the United States, the term is applied to loose...

silver chloride

(Encyclopedia)silver chloride, chemical compound, AgCl, a white cubic crystalline solid. It is nearly insoluble in water but is soluble in a water solution of ammonia, potassium cyanide, or sodium thiosulfate (“h...

bent grass

(Encyclopedia)bent grass, any species of the genus Agrostis of the family Poaceae (grass family), chiefly slender, delicate plants native to cool climates. Many are used for forage or lawns. Important species natur...

Geological Survey, United States

(Encyclopedia)Geological Survey, United States, bureau organized in 1879 under the Dept. of the Interior to unify and centralize the work already undertaken by separate surveys under Clarence King, F. V. Hayden, Ge...

Putnam, Herbert

(Encyclopedia)Putnam, Herbert, 1861–1955, American librarian, b. New York City; son of George P. Putnam. He served as librarian at the Minneapolis Athenaeum (1884–87) and of the Minneapolis Public Library (1887...