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falconry

(Encyclopedia)falconry fôlˈkənrē, fôˈ–, fălˈ– [key], sport of hunting birds or small animals with falcons or other types of hawks; eagles are used in some parts of the world. It was known to the ancient...

Rock Island, city, United States

(Encyclopedia)Rock Island, city (1990 pop. 40,552), seat of Rock Island co., NW Ill., on the Mississippi and Rock rivers, adjacent to Moline and opposite Davenport, Iowa; inc. 1841. These three cities, with Bettend...

Saratoga Springs

(Encyclopedia)Saratoga Springs, resort and residential city (1990 pop. 25,001), Saratoga co., E N.Y.; inc. as a village 1826, as a city 1915. Skidmore College is the largest source of employment, but the city also ...

Vallejo

(Encyclopedia)Vallejo vălāˈhō, –lāˈō, və– [key], city (1990 pop. 109,199), Solano co., W Calif., on San Pablo Bay at the mouth of the Napa River; inc. 1866. It is a port and a trade and processing cente...

Callaghan of Cardiff, Leonard James Callaghan, Baron

(Encyclopedia)Callaghan of Cardiff, Leonard James Callaghan, Baron, 1912–2005, British statesman. He was first elected to Parliament as a Labour member in 1945. As chancellor of the exchequer (1964–67), he intr...

mole, in chemistry

(Encyclopedia)mole, in chemistry, a quantity of particles of any type equal to Avogadro's number, or 6.02×1023 particles. One gram-molecular weight of any molecular substance contains exactly one mole of molecules...

light-year

(Encyclopedia)light-year, in astronomy, unit of length equal to the distance light travels in one sidereal year. It is 9.461 × 1012 km (about 6 million million mi). Alpha Centauri and Proxima Centauri, the stars n...

angstrom

(Encyclopedia)angstrom ăngˈstrəm [key], abbr. Å, unit of length equal to 10−10 meter (0.0000000001 meter); it is used to measure the wavelengths of visible light and of other forms of electromagnetic radiatio...

isobar

(Encyclopedia)isobar īˌsəbărˈĭk [key], line drawn on a weather map through points of equal atmospheric pressure. Isobars are used to define cyclones (low-pressure regions) and anticyclones (high-pressure regi...

barn

(Encyclopedia)barn, abbr. b, in physics, unit of nuclear cross section, i.e., the effective target presented by a nucleus for collisions leading to nuclear reactions; it is equal to 10−24 square centimeters. The ...