# stopper

/ˈstɑpɝ/ (US) · /stˈɒpɐ/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/stopper
Updated: 2026-05-08

## Definition

a small object, like a cork or a plug, that you put into the top of a bottle or jar to close it. It keeps the liquid inside and prevents air from getting in.

For teachers: an object, such as a plug or bung, designed to seal the opening of a container. Often made of glass, cork, or rubber to ensure an airtight or watertight fit.

## Examples

- She put the glass stopper back in the perfume bottle.
- After pouring the wine, he replaced the decorative stopper to keep the remaining liquid fresh.
- The chemist carefully inserted the ground-glass stopper into the flask to prevent the volatile reagents from evaporating during the overnight reaction.

## Usage notes

- Commonly refers to the removable closure of a bottle, distinct from a screw-on cap.

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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.