(n.) The writing of glossaries, glosses, or comments for illustrating an author.

criticism cryptanalysis cryptography cryptology diagnostics epigraphy exegetics glossography hermeneutics lexicology lexigraphy literary criticism metoposcopy oneirology onomasiology onomastics onomatology paleography pathognomy physiognomics physiognomy semantics semasiology semeiology semeiotics symptomatology textual criticism tropology