Word
coolant
US/ˈkuɫənt/
UK/kˈuːlənt/
Countable & uncountable Engineering
Definition
n. a liquid or gas used to keep a machine or engine from getting too hot. You usually find it in cars or large industrial machines.
n. a fluid, typically liquid or gaseous, used to transfer heat away from a mechanical or industrial system to prevent overheating.
Examples
“The car engine needs more coolant before we drive.”
“The mechanic checked the radiator for leaks because the coolant level was dropping too quickly.”
“In nuclear reactors, the primary coolant must circulate constantly to absorb thermal energy from the core and prevent a catastrophic meltdown of the fuel rods.”
Examples
simple
“The car engine needs more coolant before we drive.”
contextual
“The mechanic checked the radiator for leaks because the coolant level was dropping too quickly.”
complex
“In nuclear reactors, the primary coolant must circulate constantly to absorb thermal energy from the core and prevent a catastrophic meltdown of the fuel rods.”
Usage
Uncountable when referring to the substance generally; countable when referring to specific types or brands of the fluid.
Etymology
From cool + -ant.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Word family
NOUN
ADJECTIVE
Domain
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
- Frequency
- Occasional
- Level
- B2 · Upper Intermediate
- Updated
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englishreference.com/q/coolant