chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an ...
designation for two groups of intellectuals in mid-19th-century Russia that represented opposing schools of thought concerning the nature of Russian c...
1845–1912, English astronomer and mathematician; 2d son of Charles Darwin. He was Plumian professor (from 1883) of astronomy and experimental philos...