noun, plural roundhouses [round-hou-ziz] .
a building for the servicing and repair of locomotives, built around a turntable in the form of some part of a circle.
Nautical. a cabin on the after part of a quarterdeck.
Slang. a punch in which the arm is typically brought straight out to the side or rear of the body and in which the fist describes an exaggerated circular motion.
Also called round trip. Pinochle. a meld of one king and queen of each suit.

1580–90; round1 + house Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roundhouse (ˈraʊndˌhaʊs)
1.  a circular building in which railway locomotives are serviced or housed, radial tracks being fed by a central turntable
2.  slang boxing
 a.  a swinging punch or style of punching
 b.  (as modifier): a roundhouse style
3.  (US) pinochle a meld of all four kings and queens
4.  an obsolete word for jail
5.  obsolete a cabin on the quarterdeck of a sailing ship

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
Antibiotics have spoiled us with their power to knock bacteria to the canvas
  with a satisfying roundhouse punch.
Railroad artifacts and displays are located near the historic roundhouse.
The building once served as the roundhouse and shop for the national railroad
  system, no longer in operation.
The park contains an interpretive center, steam locomotives and cars, a
  roundhouse and such historic structures as a machine shop.
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