Source : Webster's Revised Unabridged Dictionary (1913)

Sooty \Soot"y\, a. [Compar {Sootier}; superl. {Sootiest}.] [AS.
   s?tig. See {Soot}.]
   1. Of or pertaining to soot; producing soot; soiled by soot.
      ``Fire of sooty coal.'' --Milton.

   2. Having a dark brown or black color like soot; fuliginous;
      dusky; dark. ``The grisly legions that troop under the
      sooty flag of Acheron.'' --Milton.

   {Sooty albatross} (Zo["o]l.), an albatross ({Ph[oe]betria
      fuliginosa}) found chiefly in the Pacific Ocean; -- called
      also {nellie}.

   {Sooty tern} (Zo["o]l.), a tern ({Sterna fuliginosa}) found
      chiefly in tropical seas.

Source : WordNet®

sooty
     adj : of the blackest black; similar to the color of jet or coal
           [syn: {coal-black}, {jet}, {jet-black}, {pitchy}]
     [also: {sootiest}, {sootier}]

sootier
     See {sooty}