From The Collaborative International Dictionary of English v.0.48:

Nasturtium \Nas*tur"tium\, n. [L. nasturtium, for nasitortium,
   fr. nasus nose + torquere, tortum, to twist, torture, in
   allusion to the causing one to make a wry face by its pungent
   taste. See Nose of the face, and Torture.]
   1. (Bot.) A genus of cruciferous plants, having white or
      yellowish flowers, including several species of cress.
      They are found chiefly in wet or damp grounds, and have a
      pungent biting taste.
      [1913 Webster]

   2. (Bot.) Any plant of the genus Tropaeolum, geraniaceous
      herbs, having mostly climbing stems, peltate leaves, and
      spurred flowers, and including the common Indian cress
      (Tropaeolum majus), the canary-bird flower ({Tropaeolum
      peregrinum}), and about thirty more species, all natives
      of South America. The whole plant has a warm pungent
      flavor, and the fleshy fruits are used as a substitute for
      capers, while the leaves and flowers are sometimes used in
      [1913 Webster]
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