slot machine

noun4

1. •
   Any machine operated by placing money or a token into a slot.
2. •
   A machine so operated to play games of chance for money, especially those with a lever and three or more rollers used to achieve combinations.

   • As an illustration of a general technique for calculating odds, suppose you are playing a 25-cent slot machine. — 2005
3. •
   (old-fashioned) A gas stove that requires the insertion of a coin to operate.
4. •
   Synonym of vending machine.

   • The paperback selling slot-machine was only one resourceful trade invention, […] — 1998