Scar (noun)

1. A mark left on the skin or within body tissue where a wound, burn, or sore has not healed completely and fibrous tissue has developed.
2. Something that serves as a reminder of a past event or experience.
3. A permanent visible mark left on the skin after a wound or injury has healed.

Origin:

Middle english: from old norse skar; related to middle low german scherbe "chip".

Examples:

1. The scar on her knee was a reminder of her childhood accident.
2. The surgical procedure left a noticeable scar on his abdomen.
3. The burn left a scar on her arm that was difficult to conceal.
4. The experience left emotional scars that took years to heal.
5. The accident left a permanent scar on the car's hood.