slot machine

noun
1.
a gambling machine operated by inserting coins into a slot and pulling a handle that activates a set of spinning symbols on wheels, the final alignment of which determines the payoff that is released into a receptacle at the bottom.
2.
any machine operated by inserting coins into a slot, as a vending machine.

Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
slot machine
 
n
a machine, esp one for selling small articles or for gambling, activated by placing a coin or metal disc in a slot

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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Encyclopedia Britannica
Encyclopedia

slot machine

gambling device operated by dropping one or more coins or tokens into a slot and pulling a handle or pushing a button to activate one to three or more reels marked into horizontal segments by varying symbols. The machine pays off by dropping into a cup or trough from two to all the coins in the machine, depending on how and how many of the symbols line up when the rotating reels come to rest. Symbols traditionally used include stars, card suits, bars, numbers (7 is a favourite), various pictured fruits-cherries, plums, oranges, lemons, and watermelons-and the words jackpot and bar

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Space fans can today play a cosmic slot machine to help astronomers understand
  the biggest pile-ups in the universe.
Or they'll believe more fervently that they got a slot machine that had simply
  gone cold, offering them no chance to win.
He pours powder in and rams in the quarters, pretending he's playing a slot
  machine.
During his first term as governor, he proposed using slot machine revenue to
  reduce property taxes and increase education funding.
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