Definitions:

1. in linguistics, a type of epenthesis, where a consonant is added to the middle of a word noun
   • Pronouncing hamster with a 'P' sound after the 'M' is a common form of excrescence.
2. in pathology, an abnormal outgrowth or enlargement of some part of the body noun
   • The excrescence of the patient's knee was going to be reduced to a normal size in the operation.
3. something that bulges out or is protuberant or projects from its surroundings noun
   • The root of the tree slowly became an excrescence as it grew in the crack of the sidewalk.

Synonyms:

• extrusion