A medium, usually fluid, used to draw heat from an object.

(of a nuclear reactor) that uses liquid sodium as a coolant

Used other than figuratively or idiomatically: see cool, it. / (informal) Calm down, relax, take a time out.

One who coordinates. / (sports, chiefly American football) An assistant coach responsible for a particular facet of the game, such as defense.

Ready to work with another person or in a team; ready to cooperate. / Involving cooperation between individuals or parties. / Relating to a cooperative or cooperatives.

A type of company that is owned partially or wholly by its employees, customers or tenants.

(idiomatic) Functioning particularly effectively; achieving something substantial. / Used other than figuratively or idiomatically: see cook, with, gas.

(idiomatic) A phrase, often given in response, meaning that the subject has switched to a more suitable or more efficient approach.

(informal) An evaporative cooling device; a device that cools air by blowing it through or across a moist pad or membrane.

a building, often wooden, in which a small number of poultry are housed