Definition of the Tardis from the Oxford Advanced Learner's Dictionary

 

the Tardis

 
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; NAmE
 
 
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the vehicle in which Doctor Who travels through time and space in the British children's television series. Outside, it looks like an old-fashioned British police telephone box. Inside, it is much larger than outside, and looks like a modern spacecraft It's not a very big bag, but it's like the Tardis, I can fit everything I need in it.