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Thomas Aquinas, Saint

(Encyclopedia)Thomas Aquinas, Saint əkwīˈnəs [key] [Lat.,=from Aquino], 1225–74, Italian philosopher and theologian, Doctor of the Church, known as the Angelic Doctor, b. Rocca Secca (near Naples). He is the ...

psychoanalysis

(Encyclopedia)psychoanalysis, name given by Sigmund Freud to a system of interpretation and therapeutic treatment of psychological disorders. Psychoanalysis began after Freud studied (1885–86) with the French neu...

star

(Encyclopedia)star, hot incandescent sphere of gas, held together by its own gravitation, and emitting light and other forms of electromagnetic radiation whose ultimate source is nuclear energy. The universe co...

Spanish Succession, War of the

(Encyclopedia)Spanish Succession, War of the, 1701–14, last of the general European wars caused by the efforts of King Louis XIV to extend French power. The conflict in America corresponding to the period of the ...

airplane

(Encyclopedia)CE5 A. Side view of jet-propelled airplane B. Top view airplane, aeroplane, or aircraft, heavier-than-air vehicle, mechanically driven and fitted with fixed wings that support it in flight thro...

Versailles, Treaty of

(Encyclopedia)Versailles, Treaty of, any of several treaties signed in the palace of Versailles, France. For the Treaty of Versailles of 1783, which ended the American Revolution, see Paris, Treaty of, 1783. The...

Puerto Rico

(Encyclopedia)CE5 Puerto Rico rēˈkō [key], island (2015 est. pop. 3,674,000), 3,508 sq mi (9,086 sq km), West Indies, c.1,000 mi (1,610 km) SE of Miami, Fla. Officially known as the Commonwealth of Puerto Ric...

elementary particles

(Encyclopedia)CE5 elementary particles, the most basic physical constituents of the universe. The first subatomic particle to be discovered was the electron, identified in 1897 by J. J. Thomson. After the...

Jesus, Society of

(Encyclopedia)Jesus, Society of, religious order of the Roman Catholic Church. Its members are called Jesuits. St. Ignatius of Loyola, its founder, named it Compañia de Jesús [Span.,=(military) company of Jesus];...

evolution

(Encyclopedia)CE5 Plant and animal evolution [Modified from Alfred Gunderson in Brooklyn Botanic Garden Leaflets, Ser. 18, No. 4 (1930); used by permission.] evolution, concept that embodies the belief that ex...