# pus

/ˈpəs/ (US) · /pˈʌs/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/pus
Updated: 2026-05-11

## Definition

a thick, yellowish or white liquid that forms in a part of the body that is infected. It is a sign that your body is fighting off germs.

For teachers: a thick, opaque fluid produced by infected tissue, consisting of white blood cells, bacteria, and cellular debris. Typically associated with inflammation and abscess formation.

## Examples

- The doctor cleaned the pus from the wound.
- If you notice pus coming from a cut, it usually means the area has become infected and needs medical attention.
- The presence of pus within the cavity indicated a localized immune response, as neutrophils had migrated to the site to neutralize the invading pathogens.

## Usage notes

- Uncountable; often used with verbs like 'drain', 'ooze', or 'form'.

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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.