rac·er /ˈresɚ/
 比賽者,一種黑蛇
 Ra·cer n.
 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.
 2. Zool. The common American black snake.
 3. Mil. One of the circular iron or steel rails on which the chassis of a heavy gun is turned.
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 racer
      n 1: someone who drives racing cars at high speeds [syn: race
           driver, automobile driver]
      2: a fast car that competes in races [syn: race car, racing
         car]
      3: an animal that races
      4: slender fast-moving North American snakes