Edit user dictionary

My Scrivener user dictionary has gotten cluttered up with obsolete spellings for my fantasy world. How can I edit it to delete them? Can’t (1) find which file Scrivener uses; (2) figure out how to open it.

I’m using Leopard 10.5.8 on iMac/Macbook.

Good question. I have no idea. Anyone else got an answer?

This answer is for a different question, but should point you in the right direction.