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neutrino

(Encyclopedia)neutrino no͞otrēˈnō [key] [Ital.,=little neutral (particle)], elementary particle with no electric charge and a very small mass emitted during the decay of certain other particles. The neutrino wa...

Declaration of Independence

(Encyclopedia)Declaration of Independence, full and formal declaration adopted July 4, 1776, by representatives of the Thirteen Colonies in North America announcing the separation of those colonies from Great Brita...

Austrian Succession, War of the

(Encyclopedia)Austrian Succession, War of the, 1740–48, general European war. In 1744 Frederick II, fearing the rising power of Austria, started the Second Silesian War by invading Bohemia; he was soon expell...

salmon, in zoology

(Encyclopedia)salmon sămˈən [key], member of the Salmonidae, a family of marine fish that spawn in freshwater, including the salmons, the trouts, and the chars (subfamily Salmoninae), the whitefish and the cisco...

momentum

(Encyclopedia)momentum mōmĕnˈtəm [key], in mechanics, the quantity of motion of a body, specifically the product of the mass of the body and its velocity. Momentum is a vector quantity; i.e., it has both a magn...

migration of animals

(Encyclopedia)migration of animals, movements of animals in large numbers from one place to another. In modern usage the term is usually restricted to regular, periodic movements of populations away from and back t...

Front Royal

(Encyclopedia)Front Royal, city (2020 pop. 15,382), seat of Warren co., N Va., at the junction of South and North forks of Shenandoah River, inc. 1788. Furniture, lum...

lepton

(Encyclopedia)lepton lĕpˈtŏnˌ [key] [Gr.,=light (i.e., lightweight)], class of elementary particles that includes the electron and its antiparticle, the muon and its antiparticle, the tau and its antiparticle, ...

Lee, Tsung-Dao

(Encyclopedia)Lee, Tsung-Dao dzo͝ongˈ-douˈ lēˈ [key], 1926–, American physicist, b. China, Ph.D. Univ. of Chicago, 1950. He was a member (1951–53) of the Institute for Advanced Study, Princeton; and profes...

Aceh

(Encyclopedia)Aceh äˈchā [key], special region (1980 pop. 2,875,634), 21,387 sq mi (55,392 sq km), N Sumatra, Indonesia, formerly known as Atjeh or Achin. The capital and largest city is Banda Aceh. The northern...