Columbia Encyclopedia

Search results

359 results found

baby boom

(Encyclopedia)baby boom, a period in which the birthrate is significantly higher than in other periods, especially the post–World War II period in the United States, Canada, Australia, and New Zealand. In the Uni...

solution

(Encyclopedia)CE5 Solubility curves solution, in chemistry, homogeneous mixture of two or more substances. The dissolving medium is called the solvent, and the dissolved material is called the solute. A solutio...

Du Pont

(Encyclopedia)Du Pont do͞opŏnt [key], family notable in U.S. industrial history. The Du Pont family's importance began when Eleuthère Irénée Du Pont established a gunpowder mill on the Brandywine River in N De...

Lewis, John Llewellyn

(Encyclopedia)Lewis, John Llewellyn, 1880–1969, American labor leader, b. Lucas co., Iowa; son of a Welsh immigrant coal miner. He became a miner and after 1906 rose through the union ranks to become president (1...

rattlesnake

(Encyclopedia)rattlesnake, poisonous New World snake of the pit viper family, distinguished by a rattle at the end of the tail. The head is triangular, being widened at the base. The rattle is a series of dried, ho...

Alexander III, czar of Russia

(Encyclopedia)Alexander III, 1845–94, czar of Russia (1881–94), son and successor of Alexander II. Factors that contributed to Alexander's reactionary policies included his father's assassination, his limited i...

Nkrumah, Kwame

(Encyclopedia)Nkrumah, Kwame kwäˈmā nkro͞oˈmä [key], 1909–72, African political leader, prime minister ...

polymerase chain reaction

(Encyclopedia)polymerase chain reaction pŏlˈĭmərāsˌ [key] (PCR), laboratory process in which a particular DNA segment from a mixture of DNA chains is rapidly replicated, producing a large, readily analyzed sa...

George of Podebrad

(Encyclopedia)George of Podebrad pôdˈyĕbrät [key], 1420–71, king of Bohemia (1458–71). A Bohemian nobleman, he became leader of the Utraquists, or the moderate Hussites, in the wars between Hussites and Cat...

Tantra

(Encyclopedia)Tantra tŭnˈtrə [key], in both Hinduism and Buddhism, esoteric tradition of ritual and yoga known for elaborate use of mantra, or symbolic speech, and mandala, or symbolic diagrams; the importance o...