1. 多余物;累赘
If you describe something such as a building, addition, or development as an excrescence, you strongly disapprove of it because you think it is unnecessary, bad, or ugly.

1. (pathology) an abnormal outgrowth or enlargement of some part of the body

2. something that bulges out or is protuberant or projects from its surroundings

e.g. the gun in his pocket made an obvious bulge
the hump of a camel
he stood on the rocky prominence
the occipital protuberance was well developed
the bony excrescence between its horns

Synonym: bulgebumphumpswellinggibbositygibbousnessjutprominenceprotuberanceprotrusionextrusion