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Active galactic nucleus

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• Active galaxy

  noun a galaxy that emits usually large amounts of energy from a very compact central source, such as seyfert galaxies, radio galaxies, and quasars also called active galactic nucleus active galaxy a galaxy emitting unusually high quant-ties of radiation from an active galactic nucleus at its center. some active galaxies emit more energy in radio […]

• Active hydrogen

  . hydrogen in the form of single atoms, rather than molecules, which makes it extremely reactive.

• Active hyperemia

  active hyperemia active hyperemia n. hyperemia due to increased flow of arterial blood in dilated capillaries. also called arterial hyperemia, fluxionary hyperemia. historical examples the first two produce venous or p-ssive hyperemia, and the third, arterial or active hyperemia. surgery, with special reference to podiatry maximilian stern

• Active ingredient

  noun the chemically active part of a chemical compound contemporary examples i take a triptan called treximet, which also includes a dose of the painkiller naproxen, the active ingredient in aleve. presidents can have migraines dana goldstein july 19, 2011 the national inst-tute on drug abuse reports the prevalence of mdma (the active ingredient in […]

• Active language i

  active language i tool, mathematics an early interactive mathematics system for the xds 930 at the university of california at berkeley. [“active language i”, r. de vogelaere in interactive systems for experimental applied mathematics, a-p 1968]. (1994-11-08)

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