rac·er

[rey-ser]
noun
1.
a person, animal, or thing that races or takes part in a race, as a racehorse, bicycle, yacht, etc.
2.
anything having great speed.
4.
a turntable on which a heavy gun is turned.
5.
any of several slender, active snakes of the genera Coluber and Masticophis.

Origin:
1640–50; race1 + -er1

min·i·rac·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To racer
00:10
Racer is always a great word to know.
So is quincunx. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
racer (ˈreɪsə) [Click for IPA pronunciation guide]
 
n
1.  a person, animal, or machine that races
2.  a turntable used to traverse a heavy gun
3.  any of several long slender nonvenomous North American snakes of the colubrid genus Coluber and related genera, such as C. lateralis (striped racer)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
However, if cornered, a racer may rapidly vibrate its tail and strike
  aggressively.
That's because a good racer can make its owner millions of dollars in prize
  money-and even more than that if it becomes a breeder.
The hybrid design gives the racer a more comfortable ride over a long road
  course.
There is something undeniably noble about this superstar's exit, a racer dying
  in the thick of the thing he loved.
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