GLOSSARIES OF TERMS FOR WRITING

Michelle P. Brown
Understanding Illuminated Manuscripts: A Guide to Technical Terms
Online at the British Library
(Link offline due to cyberattack)
See item at Getty

Hill Museum & Manuscript Library 
Lexicon

Paul Shaw
Script Type Terminology:  A preview of a new book
The Nomenclature of Letter Forms: A Brief Review of the Literature

Society of American Archivists
Dictionary of Archives Terminology (DAT)
“Compiled by SAA’s Dictionary Working Group, the Dictionary of Archives Terminology (DAT) expands upon A Glossary of Archival and Records Terminology by Richard Pearce-Moses (SAA, 2005), which introduced a syndetic structure and a style that was descriptive—based on actual usage—versus prescriptive. The syndetic structure provides a rich context for each entry to help users better understand its meaning and usage.”

Dianne Tillotson
Medieval Writing