antifreeze

Short definition from Wiktionary

Noun

1. 1
   A substance, such as glycol, used to lower the freezing point of water.
2. 2
   Automotive antifreeze, a solution of ethylene glycol, used as an additive to water or replacement for water, in the radiators of motorcars.
3. 3
   A deicer, a heated glycol solution used to remove ice from the aerodynamic surfaces of airplanes, and prevent icing while on the tarmac.