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pillbox

(Encyclopedia)pillbox, small, low fortification that houses machine guns and antitank weapons. Similar to a blockhouse, it is usually made of concrete, steel, logs, or filled sandbags. Pillboxes came into use durin...

dimension, in mathematics

(Encyclopedia)dimension, in mathematics, number of parameters or coordinates required locally to describe points in a mathematical object (usually geometric in character). For example, the space we inhabit is three...

Cornell, Ezra

(Encyclopedia)Cornell, Ezra, 1807–74, American financier and founder of Cornell Univ., b. Westchester Landing, N.Y. Cornell, who began life as a laborer, was of an ingenious mechanical bent and had a shrewd busin...

Zeno of Elea

(Encyclopedia)Zeno of Elea ēˈlēə [key], c.490–c.430 b.c., Greek philosopher of the Eleatic school. He undertook to support in his only known work, fragments of which are extant, the doctrine of Parmenides by ...

Valois, royal house of France

(Encyclopedia)Valois välwäˈ [key], royal house of France that ruled from 1328 to 1589. At the death of Charles IV, the last of the direct Capetians, the Valois dynasty came to the throne in the person of Philip ...

Dothan, city, United States

(Encyclopedia)Dothan dōˈthən [key], city (2020 pop. 71,072), seat of Houston co., SE Ala., near the Fla....

Cole, Timothy

(Encyclopedia)Cole, Timothy, 1852–1931, American wood engraver, b. London. He came to the United States as a child. Cole learned his trade in Chicago and later moved to New York, where in 1873 he began his 40-yea...

Chelsea, city, United States

(Encyclopedia)Chelsea, city (2020 pop. 40,787), Suffolk co., E Mass., an industrial suburb of Boston; settled 1624, inc. as a town 1739, as a city 1857. It has made p...

chord, in geometry

(Encyclopedia)chord kôrd [key], in geometry, straight line segment both end points of which lie on the circumference of a circle or other curve; it is a segment of a secant. A chord passing through the center of a...

equator

(Encyclopedia)equator, imaginary great circle around the earth, everywhere equidistant from the two geographical poles and forming the base line from which latitude is reckoned. The equator, which measures c.24,902...