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the·sau·rus [ thə sáwrəss ] (plural the·sau·ri [ thə sáw r ] or the·sau·rus·es)


noun 
Definition:
 
1. book of word groups: a book that lists words related to each other in meaning, usually giving synonyms and antonyms

2. book of subject-related vocabulary: a dictionary of words relating to a specific subject

3. treasury: a place in which valuable things are stored

[Early 19th century. Via Latin, "treasury" < Greek thēsauros "storehouse"]
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