Definition: parser

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Source: Webster's Revised Unabridged Dictionary (1913) 

Parser \Pars"er\, n.
   One who parses.

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

parser

   <language> An algorithm or program to determine the
   syntactic structure of a sentence or string of symbols in some
   language.  A parser normally takes as input a sequence of
   tokens output by a lexical analyser.  It may produce some
   kind of abstract syntax tree as output.  One of the best
   known parser generators is yacc.

   (1997-07-21)