The Collaborative International Dictionary of English v.0.48:

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.
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   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.
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   Sooty albatross (Zool.), an albatross (Phoebetria
      fuliginosa) found chiefly in the Pacific Ocean; -- called
      also nellie.

   Sooty tern (Zool.), a tern (Sterna fuliginosa) found
      chiefly in tropical seas.
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