n An approximately cylindrical container, usually with a crimped end and a screw top, used to contain and dispense semi-liquid substances.
n (British|colloquial|often capitalized as Tube) The London Undergroundrailwaysystem, originally referred to the lower level lines that ran in tubulartunnels as opposed to the higher ones which ran in rectangular section tunnels. (Often the tube.)
n (Australia|slang) A tin can containing beer (or other beverage?).(attention|en|topic=Australian English)
n (surfing) A wave which pitches forward when breaking, creating a hollow space inside.