Where are dictionaries stored in MacOS?
&quot;I’d like some way to get to them other than screen shot, OCR, and cleanup.&quot;
MacOS comes with a Dictionary.app which uses the same resources as the Lookup pop-up. You can copy text from there.

You can choose which dictionaries are included in the app's Preferences.
The Apple .dictionary format is not XML and is not human-readable without some decoding.