Tardisnoun
/ˈtɑː.dɪs//ˈtɑːr-/the Tardis also the TARDIS
in the BBC television programme "Dr. Who", a vehicle used by the Doctor to travel through time, that looks like a blue telephone box from the outside but is like a large spacecraft on the inside
[ C usually singular ] UK something that is much larger inside than it appears to be from the outside:
Many a home is a Tardis, looking small outside, but spacious within.