1. A cryptocurrency other than Bitcoin, typically created as an alternative or improvement to Bitcoin.
Usage: informal; finance/technology; often used in plural form

Examples

• Ethereum is one of the most popular altcoins on the market.
• Many investors diversify their crypto portfolios by holding both Bitcoin and altcoins.
• The altcoin market experienced significant volatility last year.
• She decided to invest in several altcoins after researching their underlying technology.
• Altcoins often promise faster transaction speeds or lower fees than Bitcoin.
• The rise of altcoins has created thousands of different cryptocurrency options for traders.