ulcer.

An open sore on skin or a mucous membrane, often involving tissue damage and slow healing.

Use it for

Words that belong together

• mouth ulcer
• skin ulcer
• stomach ulcer

On the page

The clinician examined the ulcer.

A mouth ulcer made speaking uncomfortable.

The report distinguished the ulcer from a superficial scratch.

Usage notes

Primary category: horror. Forms: Singular ulcer; plural ulcers. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.