'Slot machine' definitions:

Definition of 'slot machine'

(from WordNet)
noun
A machine that is operated by the insertion of a coin in a slot [syn: slot machine, coin machine]

Definition of 'Slot machine'

From: GCIDE
  • Slot machine \Slot" ma*chine"\ A machine the operation of which is started by dropping a coin into a slot, for delivering small articles of merchandise, showing one's weight, exhibiting pictures, throwing dice, gambling, etc. [Webster 1913 Suppl.]