Webster's English Dictionary

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precursor

Cross references:
  1. forerunner            
 
pre.cur.sor \pri-'k*r-s*r, 'pre--.\ n [L praecursor, fr. praecursus, pp. of 
   praecurrere to run befo]re, fr. prae- pre- + currere to run - more at 
   CURRENT 1a: one that precedes and indicates the approach of another  1b: 
   PREDECESSOR  2: a substance from which another substance is formed