Active hydrogen

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

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  • 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 passive hyperemia, and the third, arterial or active hyperemia. Surgery, with Special Reference to Podiatry Maximilian Stern

  • Active immunity

    immunity in an organism resulting from its own production of antibody or lymphocytes. Historical Examples The increased ingestion of bacteria in active immunity would seem to depend upon the presence of immune opsonins in the serum. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 Various An active immunity is thus induced in susceptible […]

  • 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 Institute 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)

  • Active layer

    (in arctic or subarctic regions) the layer of soil, above the permafrost, that thaws during the summer. Historical Examples In the formation of the organs of sense the nervous layer shews itself throughout as the active layer. The Works of Francis Maitland Balfour, Volume III (of 4) Francis Maitland Balfour

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