altcoin
noun /ˈɔːltkɔɪn/
  /ˈɔːltkɔɪn/
- [uncountable] any cryptocurrency (= system of electronic money used for buying and selling online) that is not bitcoin
- So far, relatively few merchants accept altcoin as a medium of exchange.
 
 - [countable] a unit of an altcoin system of money
- The value of any altcoin is equal only to how much someone will pay you for it.