\kˈuːlənt], \kˈuːlənt], \k_ˈuː_l_ə_n_t]\
Definitions of COOLANT
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a fluid agent (gas or liquid) that produces cooling; especially one used to cool a system by transfering heat away from one part to another; "he added more coolant to the car's radiator"; "the atomic reactor used a gas coolant"; "lathe operators use an emulsion of oil and water as a coolant for the cutting tool"
By Princeton University