The Collaborative International Dictionary of English v.0.48:

leopard's bane \leop"ard's bane`\ (l[e^]p"[~e]rdz b[=a]n`) n.
   (Bot.)
   A name of several harmless plants, as Arnica montana
   (Arnica acaulis syn. Doronicum acaule), Senecio
   Doronicum, and Paris quadrifolia.

   Syn: leopardbane, leopard's-bane.
        [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Mountain \Moun"tain\ (moun"t[i^]n), a.
   1. Of or pertaining to a mountain or mountains; growing or
      living on a mountain; found on or peculiar to mountains;
      among mountains; as, a mountain torrent; mountain pines;
      mountain goats; mountain air; mountain howitzer.
      [1913 Webster]

   2. Like a mountain; mountainous; vast; very great.
      [1913 Webster]

            The high, the mountain majesty of worth. --Byron.
      [1913 Webster]

   Mountain antelope (Zool.), the goral.

   Mountain ash (Bot.), an ornamental tree, the Pyrus
      Americana (or Sorbus Americana), producing beautiful
      bunches of red berries. Its leaves are pinnate, and its
      flowers white, growing in fragrant clusters. The European
      species is the Pyrus aucuparia, or rowan tree.

   Mountain barometer, a portable barometer, adapted for safe
      transportation, used in measuring the heights of
      mountains.

   Mountain beaver (Zool.), the sewellel.

   Mountain blue (Min.), blue carbonate of copper; azurite.

   Mountain cat (Zool.), the catamount. See Catamount.

   Mountain chain, a series of contiguous mountain ranges,
      generally in parallel or consecutive lines or curves.

   Mountain cock (Zool.), capercailzie. See Capercailzie.

   Mountain cork (Min.), a variety of asbestus, resembling
      cork in its texture.

   Mountain crystal. See under Crystal.

   Mountain damson (Bot.), a large tree of the genus
      Simaruba (Simaruba amarga) growing in the West Indies,
      which affords a bitter tonic and astringent, sometimes
      used in medicine.

   Mountain dew, Scotch whisky, so called because often
      illicitly distilled among the mountains. [Humorous]

   Mountain ebony (Bot.), a small leguminous tree (Bauhinia
      variegata) of the East and West Indies; -- so called
      because of its dark wood. The bark is used medicinally and
      in tanning.

   Mountain flax (Min.), a variety of asbestus, having very
      fine fibers; amianthus. See Amianthus.

   Mountain fringe (Bot.), climbing fumitory. See under
      Fumitory.

   Mountain goat. (Zool.) See Mazama.

   Mountain green. (Min.)
      (a) Green malachite, or carbonate of copper.
      (b) See Green earth, under Green, a.

   Mountain holly (Bot.), a branching shrub (Nemopanthes
      Canadensis), having smooth oblong leaves and red berries.
      It is found in the Northern United States.

   Mountain laurel (Bot.), an American shrub (Kalmia
      latifolia) with glossy evergreen leaves and showy
      clusters of rose-colored or white flowers. The foliage is
      poisonous. Called also American laurel, ivy bush, and
      calico bush. See Kalmia.

   Mountain leather (Min.), a variety of asbestus, resembling
      leather in its texture.

   Mountain licorice (Bot.), a plant of the genus Trifolium
      (Trifolium Alpinum).

   Mountain limestone (Geol.), a series of marine limestone
      strata below the coal measures, and above the old red
      standstone of Great Britain. See Chart of Geology.

   Mountain linnet (Zool.), the twite.

   Mountain magpie. (Zool.)
      (a) The yaffle, or green woodpecker.
      (b) The European gray shrike.

   Mountain mahogany (Bot.) See under Mahogany.

   Mountain meal (Min.), a light powdery variety of calcite,
      occurring as an efflorescence.

   Mountain milk (Min.), a soft spongy variety of carbonate of
      lime.

   Mountain mint. (Bot.) See Mint.

   Mountain ousel (Zool.), the ring ousel; -- called also
      mountain thrush and mountain colley. See Ousel.

   Mountain pride, or Mountain green (Bot.), a tree of
      Jamaica (Spathelia simplex), which has an unbranched
      palmlike stem, and a terminal cluster of large, pinnate
      leaves.

   Mountain quail (Zool.), the plumed partridge (Oreortyx
      pictus) of California. It has two long, slender,
      plumelike feathers on the head. The throat and sides are
      chestnut; the belly is brown with transverse bars of black
      and white; the neck and breast are dark gray.

   Mountain range, a series of mountains closely related in
      position and direction.

   Mountain rice. (Bot.)
      (a) An upland variety of rice, grown without irrigation,
          in some parts of Asia, Europe, and the United States.
      (b) An American genus of grasses (Oryzopsis).

   Mountain rose (Bot.), a species of rose with solitary
      flowers, growing in the mountains of Europe (Rosa
      alpina).

   Mountain soap (Min.), a soft earthy mineral, of a brownish
      color, used in crayon painting; saxonite.

   Mountain sorrel (Bot.), a low perennial plant (Oxyria
      digyna with rounded kidney-form leaves, and small
      greenish flowers, found in the White Mountains of New
      Hampshire, and in high northern latitudes. --Gray.

   Mountain sparrow (Zool.), the European tree sparrow.

   Mountain spinach. (Bot.) See Orach.

   Mountain tobacco (Bot.), a composite plant (Arnica
      montana) of Europe; called also leopard's bane.

   Mountain witch (Zool.), a ground pigeon of Jamaica, of the
      genus Geotrygon.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tobacco \To*bac"co\, n. [Sp. tabaco, fr. the Indian tabaco the
   tube or pipe in which the Indians or Caribbees smoked this
   plant. Some derive the word from Tabaco, a province of
   Yucatan, where it was said to be first found by the
   Spaniards; others from the island of Tobago, one of the
   Caribbees. But these derivations are very doubtful.]
   1. (Bot.) An American plant (Nicotiana Tabacum) of the
      Nightshade family, much used for smoking and chewing, and
      as snuff. As a medicine, it is narcotic, emetic, and
      cathartic. Tobacco has a strong, peculiar smell, and an
      acrid taste.
      [1913 Webster]

   Note: The name is extended to other species of the genus, and
         to some unrelated plants, as Indian tobacco (Nicotiana
         rustica, and also Lobelia inflata), mountain tobacco
         (Arnica montana), and Shiraz tobacco (Nicotiana
         Persica).
         [1913 Webster]

   2. The leaves of the plant prepared for smoking, chewing,
      etc., by being dried, cured, and manufactured in various
      ways.
      [1913 Webster]

   Tobacco box (Zool.), the common American skate.

   Tobacco camphor. (Chem.) See Nicotianine.

   Tobacco man, a tobacconist. [R.]

   Tobacco pipe.
      (a) A pipe used for smoking, made of baked clay, wood, or
          other material.
      (b) (Bot.) Same as Indian pipe, under Indian.

   Tobacco-pipe clay (Min.), a species of clay used in making
      tobacco pipes; -- called also cimolite.

   Tobacco-pipe fish. (Zool.) See Pipemouth.

   Tobacco stopper, a small plug for pressing down the tobacco
      in a pipe as it is smoked.

   Tobacco worm (Zool.), the larva of a large hawk moth
      (Sphinx Carolina syn. Phlegethontius Carolina). It is
      dark green, with seven oblique white stripes bordered
      above with dark brown on each side of the body. It feeds
      upon the leaves of tobacco and tomato plants, and is often
      very injurious to the tobacco crop. See Illust. of Hawk
      moth.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Arnicin \Ar"ni*cin\, n. [See Arnica.] (Chem.)
   An active principle of Arnica montana. It is a bitter
   resin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Arnica \Ar"ni*ca\, n. [Prob. a corruption of ptarmica.] (Bot.)
   A genus of plants; also, the most important species (Arnica
   montana), native of the mountains of Europe, used in
   medicine as a narcotic and stimulant.
   [1913 Webster]

   Note: The tincture of arnica is applied externally as a
         remedy for bruises, sprains, etc.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Arnica montana
    n 1: herb of pasture and open woodland throughout most of Europe
         and western Asia having orange-yellow daisylike flower
         heads that when dried are used as a stimulant and to treat
         bruises and swellings