...
I'm actually blind.
I thought I had all Glossary entries unlocked. I remember going through them and checking them out one by one. Turns out, I am in fact missing one.
The 3rd entry from the Moor. Got 1/2 unlocked on that one, all the rest are unlocked. I'm currently going through all of Jessie's choices that happen in this area to try and unlock it, if I understood correctly that's how it works.