Definitions:

1. A device that connects a computer or a local network to the internet through a cable television line. NOUN
   • After connecting the cable modem to the router, all devices in the house had access to the internet.
2. A modem that connects a personal computer to a fiberoptic cable, typically one used by a digital television system to provide broadband access. NOUN
   • The cable modem in her home provided high-speed internet access through the same line as her cable TV.

Synonyms:

• broadband gateway
• broadband modem
• broadband router