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ellipse

(Encyclopedia)CE5 Ellipse ellipse, closed plane curve consisting of all points for which the sum of the distances between a point on the curve and two fixed points (foci) is the same. It is the conic section fo...

Jodhpur

(Encyclopedia)Jodhpur märˈwär [key], former principality, Rajasthan state, NW India. Except for the eastern section, it is largely an arid wasteland. The principality was founded in the 13th cent. by the Rathor ...

Lusatia

(Encyclopedia)Lusatia lo͞osāˈshə [key], Ger. Lausitz, Pol. Łużyce, region of E Germany and SW Poland. It extends N from the Lusatian Mts., at the Czech border, and W from the Oder River. The hilly and fertile...

meninges

(Encyclopedia)CE5 Meninges: Section of spine showing meningeal layers meninges mĭnĭnˈjēz [key], three membranous layers of connective tissue that envelop the brain and spinal cord (see nervous system). The ...

Arrokoth

(Encyclopedia)Arrokoth, trans-Neptunian object in the Kuiper Belt (see comet). First observed by the Hubble Space Telescope in 2014 and later nicknamed Ultima Thule (until its official naming in late 2019), it beca...

Arecibo Observatory

(Encyclopedia)Arecibo Observatory, radio-astronomy facility located near Arecibo, Puerto Rico, part of the National Astronomy and Ionosphere Center. Conceived by, designed by, and built under the supervision of Wil...

Smetana, Bedřich

(Encyclopedia)Smetana, Bedřich bĕˈdərzhĭkh smĕˈtänä [key], 1824–84, Czech composer, creator of a national style in Czech music. He studied in Pilsen and in Prague, where in 1848, with the encouragement o...

Petronius

(Encyclopedia)Petronius pĭtrōˈnēəs [key], d. c.a.d. 66, Roman satirist, known as Petronius Arbiter because of his now generally accepted identity with Gaius Petronius, to whom Tacitus refers as arbiter elegant...

integration

(Encyclopedia)integration, in U.S. history, the goal of an organized movement to break down the barriers of discrimination and segregation separating African Americans from the rest of American society. Racial segr...

Erie Canal

(Encyclopedia)Erie Canal, artificial waterway, c.360 mi (580 km) long; connecting New York City with the Great Lakes via the Hudson River. Locks were built to overcome the 571-ft (174-m) difference between the leve...