1. a reference book containing lists of words with similar meanings (synonyms) and sometimes opposite meanings (antonyms)

Examples

• She consulted a thesaurus to find a better word than ‘good’ for her essay.
• The writer kept a thesaurus on his desk to help vary his vocabulary.
• Students often use a thesaurus when they want to avoid repeating the same words.
• The online thesaurus suggested several alternatives to the word ‘happy’.
• Her thesaurus helped her find more precise words for her poetry.
• The teacher recommended using a thesaurus to improve writing skills.