Etymology
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pacer (n.)

1660s, "a horse whose natural gait is a pace," agent noun from pace (v.). As "one who measures by pacing," by 1835.

updated on December 04, 2019

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Definitions of pacer from WordNet

pacer (n.)
a horse used to set the pace in racing;
Synonyms: pacemaker / pacesetter
pacer (n.)
a horse trained to a special gait in which both feet on one side leave the ground together;
From wordnet.princeton.edu, not affiliated with etymonline.