You can add the Webster dictionary to your Kobo.
How to add custom dictionary see,
here.
Chambers 1908 and Websters 1913:
https://www.mobileread.com/forums/sh...d.php?t=196925
More English dictionaries: Wiktionary, WordNet, GCIDE.
https://www.mobileread.com/forums/sh...&postcount=162
If you sync your device the dictionaries will delete, so to avoid that you have two options:
- Patch the firmware and enable the patch `Change dicthtml strings to micthtml`.
- To add a new dictionary on your device see here.
Edit: the Webster dictionary is not Merriam Webster, but Webster's Unabridged.