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expansion

(Encyclopedia)expansion, in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between...

Grand Canyon

(Encyclopedia)Grand Canyon, great gorge of the Colorado River, one of the natural wonders of the world; c.1 mi (1.6 km) deep, from 4 to 18 mi (6.4–29 km) wide, and 217 mi (349 km) long, NW Ariz. The canyon shows ...

Froebel, Friedrich Wilhelm August

(Encyclopedia)Froebel, Friedrich Wilhelm August frāˈbəl, frōˈ–, Ger. frēˈdrĭkh vĭlˈhĕlm ouˈgo͝ost fröˈbəl [key], 1782–1852, German educator and founder of the kindergarten system. He had an unha...

Kickapoo

(Encyclopedia)Kickapoo kĭkˈəpo͞o [key], Native North Americans whose language belongs to the Algonquian branch of the Algonquian-Wakashan linguistic stock (see Native American languages) and who in the late 17t...

spectrum

(Encyclopedia)CE5 Dispersion of white light by a triangular prism spectrum, arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other propert...

Plato

(Encyclopedia)Plato plāˈtō [key], 427?–347 b.c., Greek philosopher. Plato's teachings have been among the most influential in the history of Western civilization. Many of the late dialogues are devoted to te...

Cobbett, William

(Encyclopedia)Cobbett, William kŏbˈĭt [key], 1763?–1835, British journalist and reformer. The son of a farm laborer, he ran away from home at 14 and later joined the British army. He resigned in order to expos...

Peirce, Charles Sanders

(Encyclopedia)Peirce, Charles Sanders pûrs [key], 1839–1914, American philosopher and polymath, b. Cambridge, Mass., grad. Harvard, 1859; son of Benjamin Peirce. Except for occasional lectures he renounced the r...

mammal

(Encyclopedia)mammal, an animal of the highest class of vertebrates, the Mammalia. The female has mammary glands, which secrete milk for the nourishment of the young after birth. In the majority of mammals the body...

Fish, Hamilton, 1808–93, American statesman

(Encyclopedia)Fish, Hamilton, 1808–93, American statesman, b. New York City, grad. Columbia, 1827; son of Nicholas Fish (1758–1833). He studied law and was admitted to the bar in 1830. Named for his father's fr...