silver dollar

noun3

1. •
   (US) A dollar coin, whether made from silver or not.

   • In Las Vegas, many of the slot machines use silver dollars.
2. •
   (US) A small pancake.

   • Alice went to the diner and ordered a stack of silver dollars with butter and blueberry syrup.
3. •
   Several species of tropical freshwater fish of the genus Metynnis, of the family Characidae or Serrasalmidae, of which Metynnis argenteus is one; popular for aquariums; so named from their shape and flashing silver color.