An "altcoin" is a term used to describe any cryptocurrency other than Bitcoin. It's like a different type of digital money that operates on its own technology apart from Bitcoin. Full definition
OMG actually corrected less than most other altcoins in the space having fallen from a high of $ 24 to its current price of just under $ 10. (cryptotimes.news)
The number of altcoins in circulation is expected to rise as more companies issue coin offerings. (hacked.com)
He mentioned that bitcoin is what provides all these other altcoins with value. (dailybitcoinnews.com)