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planarian

(Encyclopedia)planarian, common name for several genera of the free-living (turbellarian) flatworms belonging to the order Tricladida, a name that derives from their characteristic three-branched digestive cavities...

Santa Fe, city, United States

(Encyclopedia)Santa Fe sănˈtə fā [key], city (1990 pop. 55,859), alt. c.7,000 ft (2,130 m), state capital and seat of Santa Fe co., N N.Mex., at the foot of the Sangre de Cristo Mts. It is an administrative, to...

Devonian period

(Encyclopedia)Devonian period dĭvōˈnēən [key], fourth period of the Paleozoic era of geologic time between 408 and 360 million years ago (see Geologic Timescale, tablegeologic timescale, table). It was named (...

wagon train

(Encyclopedia)wagon train, in U.S. history, a group of covered wagons used to convey people and supplies to the West before the coming of the railroad. The wagon replaced the pack, or horse, train in land commerce ...

bubble chamber

(Encyclopedia)bubble chamber, device for detecting charged particles and other radiation by means of tracks of bubbles left in a chamber filled with liquid hydrogen or other liquefied gas. It was invented in 1952 b...

Ordovician period

(Encyclopedia)Ordovician period ôrdəvĭshˈən [key] [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) fr...

Nebraska

(Encyclopedia)CE5 Nebraska nəbrăsˈkə [key], Great Plains state of the central United States. It is bordered by Iowa and Missouri, across the Missouri River (E), Kansas (S), Colorado (SW), Wyoming (NW), and S...

Hudson, river, United States

(Encyclopedia)Hudson, river, c.315 mi (510 km) long, rising in Lake Tear of the Clouds, on Mt. Marcy in the Adirondack Mts., NE N.Y., and flowing generally S to Upper New York Bay at New York City; the Mohawk River...

hound

(Encyclopedia)hound, classification used by breeders and kennel clubs to designate dogs bred to hunt animals. Most of the dogs in this group hunt by scent, their quarry ranging from such large game as bear or elk t...

Great Migration

(Encyclopedia)Great Migration, in U.S. history. 1 The migration of Puritans to New England from England, 1620–40, prior to the English civil war. As a result of the increasingly tyrannical rule of King Charles I ...