pacer

[ pey-ser ]
/ ˈpeɪ sər /

noun

a person or thing that paces.
a standard-bred horse that is used for pacing in harness racing.
a pacemaker.

Origin of pacer

First recorded in 1650–60; pace1 + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for pacer

pacer

/ (ˈpeɪsə) /

noun

a horse trained to move at a special gait, esp for racing
another word for pacemaker (def. 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012