Merriam Webster Mobile English Dictionary Series
Merriam-Webster is America's foremost publisher of language-related reference works ever. It published in a diverse print products available out there including in mobile dictionary version.
Several product that can be downloaded (demo version):
- Merriam-Webster’s Third New International Dictionary
Merriam-Webster's Collegiate Dictionary
Merriam-Webster's Pocket Dictionary
Merriam-Webster's Medical Dictionary
Merriam-Webster's Spanish-English Dictionary
Available in Windows mobile, Symbian, Android, Palm OS, iPhone, MS Windows
Download from here