Source : Webster's Revised Unabridged Dictionary (1913)

Mars \Mars\, n. [L. Mars, gen. Martis, archaic Mavors, gen.
   Mavortis.]
   1. (Rom. Myth.) The god of war and husbandry.

   2. (Astron.) One of the planets of the solar system, the
      fourth in order from the sun, or the next beyond the
      earth, having a diameter of about 4,200 miles, a period of
      687 days, and a mean distance of 141,000,000 miles. It is
      conspicuous for the redness of its light.

   3. (Alchemy) The metallic element iron, the symbol of which
      [male] was the same as that of the planet Mars. [Archaic]
      --Chaucer.

   {Mars brown}, a bright, somewhat yellowish, brown.