Radiator

1. A radiator is a hollow metal device, usually connected by pipes to a central heating system, that is used to heat a room.
2. The radiator in a car is the part of the engine which is filled with water in order to cool the engine.
Radiator is an equipment which keeps the engine cool.

Radiators are found as components of some spacecraft. These radiators work by radiating heat energy away as light (generally infrared given the temperatures at which spacecraft try to operate) because in the vacuum of space neither convection nor conduction can work to transfer heat away. On the International Space Station, these can be seen clearly as large white panels attached to the main truss. They can be found on both manned and unmanned craft.

Sources:

Англійський словник Коллінза, електронний ресурс: https://www.collinsdictionary.com/

Nick Brieger, Alison Pohl: Technical English Vocabulary and Grammar

"Radiators". International Space Station. NASA. Retrieved September 26, 2015.