from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. To transmit, as by cable, programs confined to the interests of a specific group of viewers, subscribers, or listeners, such as physicians, businesspeople, or teenagers.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To transmit a programme to selected individuals or groups, especially via cable
- n. A programme transmitted in this manner
narrow + (broad)cast.(American Heritage® Dictionary of the English Language, Fourth Edition)
From narrow, by analogy with broadcast (Wiktionary)