The Collaborative International Dictionary of English v.0.48:

Scarlet \Scar"let\, a.
   Of the color called scarlet; as, a scarlet cloth or thread.
   [1913 Webster]

   Scarlet admiral (Zool.), the red admiral. See under Red.
      -- Scarlet bean (Bot.), a kind of bean (Phaseolus
      multiflorus) having scarlet flowers; scarlet runner.

   Scarlet fever (Med.), a contagious febrile disease
      characterized by inflammation of the fauces and a scarlet
      rash, appearing usually on the second day, and ending in
      desquamation about the sixth or seventh day.

   Scarlet fish (Zool.), the telescope fish; -- so called from
      its red color. See under Telescope.

   Scarlet ibis (Zool.) See under Ibis.

   Scarlet maple (Bot.), the red maple. See Maple.

   Scarlet mite (Zool.), any one of numerous species of bright
      red carnivorous mites found among grass and moss,
      especially Thombidium holosericeum and allied species.
      The young are parasitic upon spiders and insects.

   Scarlet oak (Bot.), a species of oak (Quercus coccinea)
      of the United States; -- so called from the scarlet color
      of its leaves in autumn.

   Scarlet runner (Bot.), the scarlet bean.

   Scarlet tanager. (Zool.) See under Tanager.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bean \Bean\ (b[=e]n), n. [OE. bene, AS. be['a]n; akin to D.
   boon, G. bohne, OHG. p[=o]na, Icel. baun, Dan. b["o]nne, Sw.
   b["o]na, and perh. to Russ. bob, L. faba.]
   1. (Bot.) A name given to the seed of certain leguminous
      herbs, chiefly of the genera Faba, Phaseolus, and
      Dolichos; also, to the herbs.
      [1913 Webster]

   Note: The origin and classification of many kinds are still
         doubtful. Among true beans are: the black-eyed bean and
         China bean, included in Dolichos Sinensis; black
         Egyptian bean or hyacinth bean, Dolichos Lablab; the
         common haricot beans, kidney beans, string beans, and
         pole beans, all included in Phaseolus vulgaris; the
         lower bush bean, Phaseolus vulgaris, variety nanus;
         Lima bean, Phaseolus lunatus; Spanish bean and
         scarlet runner, Phaseolus multiflorus; Windsor bean,
         the common bean of England, Faba vulgaris.
         [1913 Webster] As an article of food beans are classed
         with vegetables.
         [1913 Webster]

   2. The popular name of other vegetable seeds or fruits, more
      or less resembling true beans.
      [1913 Webster]

   Bean aphis (Zool.), a plant louse (Aphis fab[ae]) which
      infests the bean plant.

   Bean fly (Zool.), a fly found on bean flowers.

   Bean goose (Zool.), a species of goose (Anser segetum).


   Bean weevil (Zool.), a small weevil that in the larval
      state destroys beans. The American species is Bruchus
      fab[ae].

   Florida bean (Bot.), the seed of Mucuna urens, a West
      Indian plant. The seeds are washed up on the Florida
      shore, and are often polished and made into ornaments.

   Ignatius bean, or St. Ignatius's bean (Bot.), a species
      of Strychnos.

   Navy bean, the common dried white bean of commerce;
      probably so called because an important article of food in
      the navy.

   Pea bean, a very small and highly esteemed variety of the
      edible white bean; -- so called from its size.

   Sacred bean. See under Sacred.

   Screw bean. See under Screw.

   Sea bean.
      (a) Same as Florida bean.
      (b) A red bean of unknown species used for ornament.

   Tonquin bean, or Tonka bean, the fragrant seed of
      Dipteryx odorata, a leguminous tree.

   Vanilla bean. See under Vanilla.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Phaseolus multiflorus
    n 1: tropical American bean with red flowers and mottled black
         beans similar to Phaseolus vulgaris but perennial; a
         preferred food bean in Great Britain [syn: scarlet
         runner, scarlet runner bean, Dutch case-knife bean,
         runner bean, Phaseolus coccineus, Phaseolus
         multiflorus]