Excursus

ex·cur·sus /ekˈskərsəs/

noun
noun: excursus; plural noun: excursus; plural noun: excursuses
  1. a detailed discussion of a particular point in a book, usually in an appendix.
    • a digression in a written text.

Extirpate

verb

  1. root out and destroy completely

[The Tempest – William Shakespeare]