# epi

CEFR C1 · Noun

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

## Definition

a medical tool used to quickly inject medicine during a dangerous allergic reaction. It is a short name for an epinephrine autoinjector.

For teachers: an autoinjector device used for the emergency administration of epinephrine to treat anaphylaxis. Informal clipping of 'epinephrine autoinjector'.

## Examples

- He always carries an epi in case he eats peanuts by mistake.
- The school nurse keeps an epi in the first-aid kit to treat students with severe bee-sting allergies.
- While the brand name is widely known, many patients simply refer to their life-saving medication as an epi when discussing emergency protocols with their healthcare providers.

## Usage notes

- Commonly used in medical and domestic contexts as a shorthand for the full device name.

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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.