Source : Webster's Revised Unabridged Dictionary (1913)

Screamer \Scream"er\, n. (Zo["o]l.)
   Any one of three species of South American birds constituting
   the family {Anhimid[ae]}, and the suborder {Palamede[ae]}.
   They have two spines on each wing, and the head is either
   crested or horned. They are easily tamed, and then serve as
   guardians for other poultry. The crested screamers, or
   chajas, belong to the genus {Chauna}. The horned screamer, or
   kamichi, is {Palamedea cornuta}.

Screamer \Scream"er\, n.
   1. Something so remarkable as to provoke a scream, as of joy.
      [Slang]

   2. An exclamation mark. [Printer's Slang]

Source : WordNet®

screamer
     n 1: someone who communicates vocally in a very loud voice [syn:
          {roarer}, {bawler}, {bellower}, {screecher}, {shouter},
          {yeller}]
     2: a sensational newspaper headline
     3: gooselike aquatic bird of South America having a harsh
        trumpeting call
     4: a very hard hit ball [syn: {scorcher}]

Source : Free On-Line Dictionary of Computing

Screamer
     
        An extension of {Common Lisp} providing {nondeterministic}
        {backtracking} and {constraint} programming.
     
        {(ftp://ftp.ai.mit.edu/pub/screamer.tar.Z)}.
     
        [Isn't all backtracking nondeterministic by definition?]