noun

coolant

coolant

The car's engine needs more coolant.

The car's engine needs more coolant.

Coolant prevents the machine from overheating.

Coolant prevents the machine from overheating.

((uncountable noun)) a liquid used to cool an engine The car's engine needs more coolant.

Synonyms: cooling agent, refrigerant

From 'cool' + the agent suffix '-ant', meaning 'a thing that cools'.

Think of it as the 'agent' that keeps things 'cool', especially engines.

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