Hypertext Webster Gateway: "pacer"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Pacer \Pa"cer\, n.
One who, or that which, paces; especially, a horse that
paces.
From WordNet (r) 1.7 (wn)
pacer
n 1: a horse used to set the pace in racing [syn: {pacemaker}, {pacesetter}]
2: a horse trained to a special gait in which both feet on one
side leave the ground together
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