Sensitive paper

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.
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   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.
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            She was too sensitive to abuse and calumny.
                                                  --Macaulay.
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   3.
      (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.
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   4. Serving to affect the sense; sensible. [R.]
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            A sensitive love of some sensitive objects.
                                                  --Hammond.
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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.
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