A refrigerator, also known as a fridge, was an appliance for preserving organic material by keeping it cold.
When Sip Fel-Fotch Passameer-Day Slitheen tried to kill Jackie Tyler and Mickey Smith in his flat, they were able to use the pickled foods in his refrigerator to make a concentrated mixture of acetic acid with which to destroy him. (TV: World War Three)
Fridges were not yet invented in Roman times. While in a Roman villa in 64, Barbara Wright jokingly told Ian Chesterton there was ice in the fridge. Ian started looking for the fridge before realising what Barbara had said. Later, after returning from their adventure, Ian did the same to Barbara when he told her that there was some cold peacock left in the fridge. (TV: The Romans)