Try DictionaryToGo for Desktop to lookup up to 40 definitions.

Product features:

- Synchronize personal data between the desktop version and the Palm or Pocket PC versions of DictionaryToGo
- Database of more than 150,000 English headwords, definitions, sample sentences, and synonyms
- Optimized for fast searching, highly compressed dictionary database
- Intuitive search process allows for fastest definition lookup
- Extremely user-friendly interface, features one-tap easy access to most functions
- Features saving definitions to bookmarks
- Features history of last 100 words accessed
- Direct lookup for a definition of a word, within a definition of another word
- Supports definition lookup for plural forms of words
- Provides the part of speech the word used
- Allows copying of selected word or entire definition to clipboard
- Availability of sample sentences to most definitions
- Supports an option to enable and disable "auto scroll" button
- Variety of skins to suit user preference
- Automatic online upgrade
- Features mouse button configuration
- Quick lookup of any word from most third-party applications*

*Compatibility with existing third-applications may be limited.