dictionar englez roman

ignis fatuus


3 dicționare găsite pentru ignis fatuus
Din dicționarul The Collaborative International Dictionary of English v.0.48 :

  Ignis fatuus \Ig"nis fat"u*us\; pl. Ignes fatui. [L. ignis
     fire + fatuus foolish. So called in allusion to its tendency
     to mislead travelers.]
     1. A phosphorescent light that appears, in the night, over
        marshy ground, supposed to be occasioned by the
        decomposition of animal or vegetable substances, or by
        some inflammable gas; -- popularly called also
        Will-with-the-wisp, or Will-o'-the-wisp, and
        Jack-with-a-lantern, or Jack-o'-lantern. It is thought
        by some to be caused by phosphine, PH3, a sponaneously
        combustible gas.
        [1913 Webster + PJC]
  
              Will o'the Wisp -- which also rejoices in the names
              of Ignis Fatuus or Jack o'Lantern -- is not, as some
              of you may think, a cartoon character. In mediaeval
              times this chemical phenomenon struck terror into
              travellers and, very likely, lured some of them to
              their deaths in a stinking and marshy grave.
              I have never seen this Will o'the Wisp; nor am I
              likely to do so. It is a flickering flame seen over
              marshes; marshes are not now common in London, nor
              indeed anywhere else in Britain. In any case the
              ephemeral nature of the phenomenon and the enormous
              amount of ambient light [ldqo]pollution[rdqo] found
              in most areas means that most of us will never see
              it.
              What is this Will o'the Wisp? Popular chemical lore
              has it that it is marsh gas, or methane, which
              catches fire when it hits the air because of the
              presence of either phosphine ({PH3) or diphosphine
              ({P2H4) in the gas, both of which are spontaneously
              flammable in air. Methane is certainly formed in
              marshes, and bubbles up if the mud is disturbed in a
              pond, say. It is the same reaction that enables
              organic materials to produce biogas, methane from
              the decomposition of sewage, which can be profitably
              used. But is it this that is burning in Will o'the
              Wisp?
              Almost certainly not. At this point I will say that
              I have thought for some years off and on as to how
              one might set up an experiment to test the
              hypotheses, since the sporadic and rare nature of
              the natural version renders its investigation a
              highly intractable problem. However: the combustion
              of methane under the conditions in a marsh would
              give a yellow flame, and heat.
              Will o'the Wisp is not like this, so it is said.
              Firstly the flame is bluish, not yellow, and it is
              said to be a cold flame. The colour and the
              temperature suggests some sort of phosphorescence;
              since organic material contain phosphorus, the
              production of phosphine or diphosphine is scarcely
              impossible, and maybe it does oxidise via a mainly
              chemiluminescent reaction. The exact nature of the
              Will o'the Wisp reaction nevertheless remains, to me
              at any rate, a mystery. Similar phenomena have been
              reported in graveyards and are known as corpse
              candles. If anyone knows anything more, I would love
              to hear of it. A warning that if you look for it on
              the Web, you will get a great deal of bizarre stuff.
              You will also get the delightful picture from a
              Canadian artist which decorates the top of this page
              (http://www.rod.beavon.clara.net/willo.htm), and a
              couple of poems at least. One is also by a Canadian,
              Annie Campbell Huestis, the other by the prolific
              fantasy poet Walter de la Mare.
              The preparation of phosphine in the laboratory (by
              the teacher!) is fun, and perfectly safe in a fume
              cupboard. White phosphorus is boiled with aqueous
              sodium hydroxide solution in an apparatus from which
              all air must have been removed by purging with, say,
              natural gas. The phosphine will form marvellous
              smoke rings if allowed to bubble up through water in
              a pneumatic trough. This is an experiment for the
              teacher, needless to say. The experiment is
              described in Partington J.R., [ldqo]A Textbook of
              Inorganic Chemistry[rdqo], 6th ed, Macmillan 1957, p
              572. (So, inter alia, is a great deal of other
              interesting chemistry.)
        Dr. Rod Beavon
        17 Dean's Yard London SW1P 3PB
        e-mail: rod.beavon@westminster.org.uk
        [PJC]
  
     2. Fig.: A misleading influence; a decoy.
        [1913 Webster]
  
              Scared and guided by the ignis fatuus of popular
              superstition.                         --Jer. Taylor.
        [1913 Webster]

Din dicționarul WordNet (r) 2.0 :

  ignis fatuus
       n 1: a pale light sometimes seen at night over marshy ground
            [syn: friar's lantern, jack-o'-lantern, will-o'-the-wisp]
       2: an illusion that misleads [syn: will-o'-the-wisp]

Din dicționarul Moby Thesaurus II by Grady Ward, 1.0 :

  94 Moby Thesaurus words for "ignis fatuus":
     airy nothing, autism, autoluminescence, backfire, balefire, beacon,
     beacon fire, bioluminescence, blaze, bonfire, bubble, burning ghat,
     campfire, cathode luminescence, cheerful fire, chemicoluminescence,
     chemiluminescence, chimera, combustion, conflagration, corposant,
     cozy fire, crackling fire, crematory, crystalloluminescence,
     daydream, death fire, deception, deluded belief, delusion, dereism,
     double corposant, dream, dream vision, dreamland, dreamworld,
     electroluminescence, false belief, fata morgana, fen fire, fire,
     flame, flashing point, flicker, flickering flame, fluorescence,
     forest fire, fox fire, funeral pyre, hallucination, ignition,
     illusion, ingle, lambent flame, luciferase, luciferin,
     luminescence, luminophor, marshfire, mirage, misbelief,
     misconception, noctiluscence, open fire, phantasm, phosphor,
     phosphorescence, photoluminescence, pipe dream, prairie fire, pyre,
     radioluminescence, raging fire, sea of flames, self-deceit,
     self-deception, self-delusion, sheet of fire, signal beacon,
     smudge fire, thermoluminescence, three-alarm fire,
     tribofluorescence, triboluminescence, tribophosphorescence, trick,
     trip, two-alarm fire, vapor, watch fire, wildfire, wisp,
     witch fire, wrong impression  
     

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