The Collaborative International Dictionary of English v.0.48:

Pansy \Pan"sy\, n.; pl. Pansies. [F. Pens['e]e thought, pansy,
   fr. penser to think, L. pensare to weigh, ponder. See
   Pensive.] (Bot.)
   A plant of the genus Viola (Viola tricolor) and its
   blossom, originally purple and yellow. Cultivated varieties
   have very large flowers of a great diversity of colors.
   Called also heart's-ease, love-in-idleness, and many
   other quaint names.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Violaquercitrin \Vi`o*la*quer"cit*rin\, n. (Chem.)
   A yellow crystalline glucoside obtained from the pansy
   (Viola tricolor), and decomposing into glucose and
   quercitrin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Violet \Vi"o*let\, n. [F. violette a violet (cf. violet
   violet-colored), dim. of OF. viole a violet, L. viola; akin
   to Gr. ?. Cf. Iodine.]
   1. (Bot.) Any plant or flower of the genus Viola, of many
      species. The violets are generally low, herbaceous plants,
      and the flowers of many of the species are blue, while
      others are white or yellow, or of several colors, as the
      pansy (Viola tricolor).
      [1913 Webster]

   Note: The cultivated sweet violet is Viola odorata of
         Europe. The common blue violet of the eastern United
         States is Viola cucullata; the sand, or bird-foot,
         violet is Viola pedata.
         [1913 Webster]

   2. The color of a violet, or that part of the spectrum
      farthest from red. It is the most refrangible part of the
      spectrum.
      [1913 Webster]

   3. In art, a color produced by a combination of red and blue
      in equal proportions; a bluish purple color. --Mollett.
      [1913 Webster]

   4. (Zool.) Any one of numerous species of small
      violet-colored butterflies belonging to Lycaena, or
      Rusticus, and allied genera.
      [1913 Webster]
      [1913 Webster]

   Corn violet. See under Corn.

   Dame's violet. (Bot.) See Damewort.

   Dogtooth violet. (Bot.) See under Dogtooth.

   Water violet (Bot.), an aquatic European herb (Hottonia
      palustris) with pale purplish flowers and pinnatifid
      leaves.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Heart's-ease \Heart's"-ease`\ (h[aum]rts"[=e]z`), n.
   1. Ease of heart; peace or tranquillity of mind or feeling.
      --Shak.
      [1913 Webster]

   2. (Bot.) A species of violet (Viola tricolor), a common
      and long cultivated European herb from which most common
      garden pansies are derived; -- called also pansy.
      [WordNet sense 1]

   Syn: wild pansy, Johnny-jump-up, heartsease,
        love-in-idleness, pink of my John, Viola tricolor.
        [1913 Webster + WordNet 1.5]

   3. (Bot.) A violet of the Pacific coast of North America
      (Viola ocellata) having white petals tinged with yellow
      and deep violet. [WordNet sense 2]

   Syn: two-eyed violet, heartsease, Viola ocellata.
        [WordNet 1.5]

   4. (Bot.) A common Old World viola (Viola arvensis) with
      creamy often violet-tinged flowers. [WordNet sense 3]

   Syn: field pansy, heartsease, Viola arvensis.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Viola tricolor
    n 1: a common and long cultivated European herb from which most
         common garden pansies are derived [syn: wild pansy,
         Johnny-jump-up, heartsease, love-in-idleness, pink
         of my John, Viola tricolor]