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 for Sensitive flame
From The Collaborative International Dictionary of English v.0.48 :

  Sensitive \Sen"si*tive\, a. [F. sensitif. See Sense.]
     1. Having sense of feeling; possessing or exhibiting the
        capacity of receiving impressions from external objects;
        as, a sensitive soul.
        [1913 Webster]
     2. Having quick and acute sensibility, either to the action
        of external objects, or to impressions upon the mind and
        feelings; highly susceptible; easily and acutely affected.
        [1913 Webster]
              She was too sensitive to abuse and calumny.
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        (a) (Mech.) Having a capacity of being easily affected or
            moved; as, a sensitive thermometer; sensitive scales.
        (b) (Chem. & Photog.) Readily affected or changed by
            certain appropriate agents; as, silver chloride or
            bromide, when in contact with certain organic
            substances, is extremely sensitive to actinic rays.
            [1913 Webster]
     4. Serving to affect the sense; sensible. [R.]
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              A sensitive love of some sensitive objects.
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     5. Of or pertaining to sensation; depending on sensation; as,
        sensitive motions; sensitive muscular motions excited by
        irritation. --E. Darwin.
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     Sensitive fern (Bot.), an American fern ({Onoclea
        sensibilis), the leaves of which, when plucked, show a
        slight tendency to fold together.
     Sensitive flame (Physics), a gas flame so arranged that
        under a suitable adjustment of pressure it is exceedingly
        sensitive to sounds, being caused to roar, flare, or
        become suddenly shortened or extinguished, by slight
        sounds of the proper pitch.
     Sensitive joint vetch (Bot.), an annual leguminous herb
        ({Aeschynomene hispida), with sensitive foliage.
     Sensitive paper, paper prepared for photographic purpose by
        being rendered sensitive to the effect of light.
     Sensitive plant. (Bot.)
        (a) A leguminous plant ({Mimosa pudica, or Mimosa
            sensitiva, and other allied species), the leaves of
            which close at the slightest touch.
        (b) Any plant showing motions after irritation, as the
            sensitive brier ({Schrankia) of the Southern States,
            two common American species of Cassia ({Cassia
            nictitans, and Cassia Chamaecrista), a kind of
            sorrel ({Oxalis sensitiva), etc.
            [1913 Webster] -- Sen"si*tive*ly, adv. --
            Sen"si*tive*ness, n.
            [1913 Webster]

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