Areal velocity

a measure of the velocity of one celestial body in orbit about another, equal to the area swept out per unit time by the vector joining the two bodies.


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  • Areally

    any particular extent of space or surface; part: the dark areas in the painting; the dusty area of the room. a geographical region; tract: the Chicago area; the unsettled areas along the frontier. any section reserved for a specific function: the business area of a town; the dining area of a house. extent, range, or […]

  • Areca

    any tropical Asian palm of the genus Areca, as the betel palm. Historical Examples The roots are sometimes used for chewing, as a substitute for areca. The Cocoanut William S. Lyon He, at the same time, gave me a book for myself also written and painted by him, together with several purses for areca nut. […]

  • Arecibo

    a seaport in N Puerto Rico. Historical Examples Thence the Alamo proceeded, August 29, to Arecibo, which port was reached on the same day. The Red Cross in Peace and War Clara Barton We reached Arecibo, having to ford or ferry streams five times. The American Missionary — Volume 54, No. 01, January, 1900 Various […]

  • Arecibo observatory

    a radio-astronomy and ionospheric observatory near Arecibo, Puerto Rico: site of one of the world’s largest single-dish radio telescopes, 1000 feet (305 meters) in diameter. noun an observatory in Puerto Rico at which the world’s largest dish radio telescope (diameter 305 m) is situated. It is operated by the National Astronomy and Ionosphere Center

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