# lubricant

/ˈɫubɹəkənt/ (US) · /lˈuːbɹɪkənt/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/lubricant
Updated: 2026-05-09

## Definition

a substance like oil or grease that you put on surfaces to help them move smoothly against each other. It stops parts from rubbing together and getting too hot or damaged.

For teachers: a substance, such as oil or grease, applied to surfaces to reduce friction and wear between moving parts. Often used metaphorically to describe something that eases social or political interactions.

## Examples

- The mechanic applied a lubricant to the squeaky door hinge.
- Industrial machines require a high-quality lubricant to prevent the metal components from overheating during continuous operation.
- While the primary function of the fluid is to act as a lubricant, it also serves as a coolant by carrying heat away from the engine's internal combustion chamber.

## Usage notes

- Countable when referring to specific types or brands of the substance; uncountable when referring to the substance in general.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.