GNU Collaborative International Dictionary of English

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Found one definition

1.       
   pacer (?), n. One who, or that which, paces.
   
   [1913 Webster]
   
   
   2. Especially: A horse trained to a special gait in which both feet on one side leave the ground together; a horse that paces. [wns=2]
   
   [WordNet 1.5]
   
   
   3. A horse used to set the pace in racing. [wns=3]
   
   Syn. -- pacemaker, pacesetter.
   
   [WordNet 1.5]