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amplifier

(Encyclopedia)amplifier, device that accepts a varying input signal and produces an output signal that varies in the same way as the input but has a larger amplitude. The input signal may be a current, a voltage, a...

Guadarrama, Sierra de

(Encyclopedia)Guadarrama, Sierra de syārˈrä ᵺā gwäᵺäräˈmä [key], mountain range rising from the plateau of central Spain, N of Madrid, and extending c.120 mi (190 km) between the Tagus and Douro rivers...

Krkonoše

(Encyclopedia)Krkonoše kŭrˈkônôshĕ [key], Ger. Riesengebirge, Pol. Karkonosze, highest range of the Sudetes, extending c.25 mi (40 km) along the border of N Czech Republic and SW Poland. Its highest peak, Sn�...

Zeravshan

(Encyclopedia)Zeravshan zyĕrəfshänˈ [key], river, c.460 mi (740 km) long, rising in the Turkistan Range of the Pamir-Alai mountain system, in Tajikistan. It flows westward through the agricultural Zeravshan val...

San Gabriel Mountains

(Encyclopedia)San Gabriel Mountains, S Calif., E and NE of Los Angeles, running c.50 mi (80 km) westward from Cajon Pass. Mt. San Antonio, also known as Mt. Baldy (10,080 ft/3,072 m), is the highest peak of the ran...

Sierra Morena

(Encyclopedia)Sierra Morena syāˈrä mōrāˈnä [key], mountain range, SW Spain, extending c.375 mi (600 km) eastward along the southern edge of the Meseta (central plateau) from the Portuguese border to the Sier...

Green Mountains

(Encyclopedia)Green Mountains, range of the Appalachian Mts., extending 250 mi (402 km) from north to south and extending from S Que., Canada to Vt. Mt. Mansfield, 4,393 ft (1,339 m) high, in Vermont, is the talles...

ligament

(Encyclopedia)ligament lĭgˈəmənt [key], strong band of white fibrous connective tissue that joins bones to other bones or to cartilage in the joint areas. The bundles of collagenous fibers that form ligaments t...

Rambouillet sheep

(Encyclopedia)Rambouillet sheep rămˈbo͝olāˌ [key], fine-wool breed developed in France from the Spanish Merino sheep. It has become very popular in the United States and is the foundation of most of the Wester...

microwave

(Encyclopedia)microwave, electromagnetic wave having a frequency range from 1,000 megahertz (MHz) to 300,000 MHz, corresponding to a wavelength range from 300 mm (about 12 in.) to 1 mm (about 0.04 in.). Like light ...