01 n. One who, or that which, races, or contends in a race; esp., a race horse.
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1.
One who, or that which, races, or contends in a race; esp., a race horse.“And bade the nimblest racer seize the prize.” — Pope.
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2.
The common American black snake.(Zool.)
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3.
One of the circular iron or steel rails on which the chassis of a heavy gun is turned.(Mil.)