The Cassell Dictionary and Thesaurus (New ed)

It's two books in one, with over 200,000 entries -- and that saves time and trouble!

This combination of dictionary and thesaurus brings you right to the word you need. Because the synonyms are linked to definitions, it's less likely you'll choose one that doesn't convey exactly the right meaning.

Of course, it also does everything you'd expect a regular dictionary to do -- detail grammar, highlight slang, suggest antonyms, and give pronunciation guidelines.