1. an abnormal or unwanted growth or outgrowth on the body or on a plant
Usage: often medical or botanical context
2. something regarded as an undesirable addition or feature; a disfiguring or superfluous element
Usage: figurative use

Examples

• The doctor examined the excrescence on the patient's skin.
• Warts are common excrescences that can be removed by dermatologists.
• The modern addition was considered an excrescence on the historic building.
• Critics viewed the subplot as an excrescence that detracted from the main story.
• The tree had several excrescences where branches had been damaged.
• That garish billboard is an excrescence on the natural landscape.