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flight

(Encyclopedia)CE5 Aircraft motions and control surfaces: Yaw, or motion to the left or right, is controlled by the rudder. Pitch, or climbing or dropping, is controlled by the elevators, which move in the same d...

Frederick II, king of Prussia

(Encyclopedia)Frederick II or Frederick the Great, 1712–86, king of Prussia (1740–86), son and successor of Frederick William I. Frederick was tolerant in religious matters, personally professing atheism to h...

Eastern Question

(Encyclopedia)Eastern Question, term designating the problem of European territory controlled by the decaying Ottoman Empire in the 18th, 19th, and early 20th cent. The Turkish threat to Europe was checked by the H...

Philadelphia, city, United States

(Encyclopedia)Philadelphia, city (2020 pop. 1,603,797), coextensive with Philadelphia co., SE Pa., on the Delaware River c.100 mi (160 km) upstream at the influx of t...

blood

(Encyclopedia)blood, fluid pumped by the heart that circulates throughout the body via the arteries, veins, and capillaries (see circulatory system; heart). An adult male of average size normally has about 6 quarts...

bee

(Encyclopedia)bee, name for flying insects of the superfamily Apoidea, in the same order as the ants and the wasps. Bees are characterized by their enlarged hind feet, typically equipped with pollen baskets of stif...

Kentucky, state, United States

(Encyclopedia)CE5 Kentucky kəntŭkˈē, kĭn– [key], state of the SE central United States. It is bordered by West Virginia and Virginia (E); Tennessee (S); the Mississippi River, across which lies Missouri (...

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 ...

gem, ornamental mineral or organic substance

(Encyclopedia)gem, commonly, a mineral or organic substance, cut and polished and used as an ornament. Gems also are used as seals (items of assurance) and as talismans (good-luck charms). For birthstones, see mont...

Triple Alliance and Triple Entente

(Encyclopedia)Triple Alliance and Triple Entente äntäntˈ [key], two international combinations of states that dominated the diplomatic history of Western Europe from 1882 until they came into armed conflict in W...