# defibrillator

/diˈfɪbɹɪˌɫeɪtɝ/ (US) · /dɪfˈɪbɹɪlˌeɪtɐ/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/defibrillator
Updated: 2026-10-14

## Definition

a medical machine that gives the heart a controlled electric shock to help it start beating normally again. You often see one on the wall in airports, gyms and schools for emergencies.

For teachers: a medical device that delivers a controlled electric shock to the heart to restore normal rhythm during cardiac arrest or life-threatening arrhythmia. Includes manual hospital units and automated public-access models designed for use by trained laypeople.

## Examples

- The gym keeps a defibrillator near the front desk.
- When the runner collapsed on the track, a coach grabbed the wall-mounted defibrillator and followed its voice prompts.
- Modern public-access defibrillators analyse heart rhythm automatically and deliver a shock only when needed, allowing bystanders with minimal training to intervene before paramedics arrive.

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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.