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thesaur- (Greek > Latin: treasure, treasury, storehouse, chest; a treasury of words).


thesaural:
A reference to a thesaurus.
thesauri (or thesauruses):
The plural form of thesaurus.
thesaurus (singular):
1. A book that lists words related to each other in meaning, usually giving synonyms and antonyms.
2. A dictionary of words relating to a particular subject.
3. A place in which valuable things are stored.