Source : Webster's Revised Unabridged Dictionary (1913)

Scarlet \Scar"let\, n. [OE. scarlat, scarlet, OF. escarlate, F.
   ['e]carlate (cf. Pr. escarlat, escarlata, Sp. & Pg.
   escarlata, It. scarlatto, LL. scarlatum), from Per.
   sakirl[=a]t.]
   A deep bright red tinged with orange or yellow, -- of many
   tints and shades; a vivid or bright red color.

   2. Cloth of a scarlet color.

            All her household are clothed with scarlet. --Prov.
                                                  xxxi. 21.

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

   {Scarlet admiral} (Zo["o]l.), 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} (Zo["o]l.), the telescope fish; -- so called
      from its red color. See under {Telescope}.

   {Scarlet ibis} (Zo["o]l.) See under {Ibis}.

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

   {Scarlet mite} (Zo["o]l.), 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}. (Zo["o]l.) See under {Tanager}.

Scarlet \Scar"let\, v. t.
   To dye or tinge with scarlet. [R.]

         The ashy paleness of my cheek Is scarleted in ruddy
         flakes of wrath.                         --Ford.

Source : WordNet®

scarlet
     n : a variable color that is vivid red but sometimes with an
         orange tinge [syn: {vermilion}, {orange red}]

scarlet
     adj : having any of numerous bright or strong colors reminiscent
           of the color of blood or cherries or tomatoes or rubies
           [syn: {red}, {reddish}, {ruddy}, {blood-red}, {carmine},
            {cerise}, {cherry}, {cherry-red}, {crimson}, {ruby}, {ruby-red}]