Here's an especially handy two-in-one reference volume for middle school and high school students. The top half of every page serves as a standard dictionary, while the bottom half is a thesaurus that presents selected words from the dictionary section and gives a list of synonyms for each. This dictionary-thesaurus combination offers definitions of more than 40,000 words and phrases, augmented with over 100,000 synonyms. Headwords in both sections are printed in color. Each dictionary headword is designated by its part-of-speech and comes with one or more definitions. Every thesaurus headword--in addition to its list of synonyms--comes with an example sentence that uses the word in context. Corresponding dictionary and thesaurus entries are always cited on the same page for fast, easy reference.
Barron's Dictionary and Thesaurus
Barron's Educational Series, Incorporated
Education & Reference