The Collaborative International Dictionary of English v.0.48:

Maroon \Ma*roon"\ (m[.a]*r[=oo]n"), a. [F. marron
   chestnut-colored, fr. marron a large French chestnut, It.
   marrone; cf. LGr. ma`raon. Cf. Marron.]
   Having the color called maroon. See 4th Maroon.
   [1913 Webster]

   Maroon lake, lake prepared from madder, and distinguished
      for its transparency and the depth and durability of its
      color.
      [1913 Webster]