noun Uncommon

coolant

KOO-luhnt

Coolant (noun) means a liquid or gas used to absorb and carry away heat from a machine or system. Example: “Check the coolant level in your car's radiator every few months.”

noun

A liquid or gas used to absorb and carry away heat from a machine or system.

"Check the coolant level in your car's radiator every few months."

"The reactor uses water as its coolant."

How to use coolant

Learner’s notes

In plain EnglishA fluid whose job is to soak up heat and keep an engine or machine from overheating.

Common pairings

engine coolant coolant leak top up the coolant

Word forms

coolants plural

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Fill the gap

Can you complete this real example?

Check the _____ level in your car's radiator every few months.

Etymology

Built from cool plus the suffix -ant, which typically marks a substance that performs an action (compare "lubricant," "deodorant").

Frequently asked questions

What does “coolant” mean?

The word “coolant” means a liquid or gas used to absorb and carry away heat from a machine or system. In plain terms, a fluid whose job is to soak up heat and keep an engine or machine from overheating.

How do you pronounce “coolant”?

“Coolant” is pronounced KOO-luhnt (/ˈkuːlənt/ in IPA).

How do you use “coolant” in a sentence?

Here is “coolant” used in a sentence: “Check the coolant level in your car's radiator every few months.”

What part of speech is “coolant”?

“Coolant” is a noun.

Is “coolant” a common word?

“Coolant” is an uncommon word in modern English.