Definition of "antifreeze"

A substance, such as glycol, used to lower the freezing point of water;  examples

(automobiles) Automotive antifreeze, a solution of ethylene glycol, used as an additive to water or replacement for water, in the radiators of motorcars.  examples

(aviation) Deicer, a heated glycol solution used to remove ice from the aerodynamic surfaces of airplanes, and prevent icing while on the tarmac.  examples