Definition of the tube
1 US, informal : the television What's on the tube tonight?
2 British : the system of trains that run underground in London
Word by Word Definitions
: any of various usually cylindrical structures or devices: such as
: a hollow elongated cylinder
: one to convey fluids
Seen and Heard
What made you want to look up the tube? Please tell us where you read or heard it (including the quote, if possible).