SpellingDictionariesPath

SpellingDictionariesPath is a global option that specifies which directories are searched for spelling dictionaries when the Edit ▶ Check Spelling menu item is used.

Examples

Get current spelling dictionaries path:

$SpellingDictionariesPath

Add custom dictionary directory:

SetOptions[$FrontEnd, SpellingDictionariesPath -> {"path/to/dictionaries"}]

Please visit the official Wolfram Language Reference for more details.