Noun pacer has 2 senses
  1. pacer, pacemaker, pacesetter - a horse used to set the pace in racing
    --1 is a kind of racehorse, race horse, bangtail
    Derived form: verb pace4
  2. pacer - a horse trained to a special gait in which both feet on one side leave the ground together
    --2 is a kind of
    horse, Equus caballus
    Derived form: verb pace2
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