boob tube

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Slang Television: "Parents complain about the quality of the shows but don't prevent their children from gluing themselves to the boob tube” ( David Owen).

Wiktionary

1. n. US television
2. n. UK A type of woman's upper body garment consisting of a taut band of cloth around the breasts and back.

WordNet 3.0

1. n. an electronic device that receives television signals and displays them on a screen