Substances, usually liquids, that are used to reduce heat or keep something cool, like the fluid in car radiators.
From 'cool' (from Old English 'col,' having low temperature) plus the agent suffix '-ant' (something that performs an action). This technical term emerged in the 20th century as industrial cooling became more sophisticated.
Modern coolants are chemistry marvels—they contain antifreeze, rust inhibitors, and dyes, and switching from one type to another in your car's engine can cause catastrophic damage because some types corrode different metals.
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