1. A birthmark or mole on the skin, typically brown or reddish in color.
Usage: Medical term; also spelled 'nevus' (more common in modern usage); Plural: naevi or nevi
2. A benign tumor or growth on the skin composed of melanocytes or blood vessels.
Usage: Medical/dermatological term; Can refer to various types including vascular naevi and pigmented naevi

Examples

• The dermatologist examined the patient's naevus to ensure it was not cancerous.
• She had a small naevus on her shoulder since birth.
• The naevus darkened slightly over the summer months.
• A vascular naevus may appear as a red or purple patch on the skin.
• The doctor recommended monitoring the naevus for any changes in size or color.