In El Capitan and prior one could go to Library/Dictionaries and find all the bundles with the pre-installed dictionaries in the system plus the ones you've installed yourself. Now if I go there I find only a dictionary I have added myself and none of the pre-installed ones appear, though they work in the Dictionary app.
If I open the Dictionary app now there is an option File -> Open Dictionaries Folder, but this leads to user/dictionaries, which is a directory with cryptic stuff, none of them large enough to be the dictionaries bundles themselves.
Any clue?
[doublepost=1470407412][/doublepost]Solved!
They are in /System/Library/Assets
If I open the Dictionary app now there is an option File -> Open Dictionaries Folder, but this leads to user/dictionaries, which is a directory with cryptic stuff, none of them large enough to be the dictionaries bundles themselves.
Any clue?
[doublepost=1470407412][/doublepost]Solved!
They are in /System/Library/Assets