"What's the plural of thesaurus?"

The plural of thesaurus is thesauri or thesauruses.

Definition of thesaurus:

A thesaurus is a reference book or online resource that provides synonyms, antonyms, and related words for a given term or concept. It helps writers, students, and language enthusiasts expand their vocabulary and find alternative expressions to enhance their communication and writing skills.

Plural of Thesaurus Example Sentences


  • I often use an online thesaurus to find synonyms for words in my writing.
  • She bought a new pocket-sized thesaurus to enhance her vocabulary.
  • The writer referred to a specialized medical thesaurus for accurate terminology.


  • Writers and students find thesauri to be valuable resources for expanding their word choices.
  • Some language enthusiasts collect antique thesauri as a hobby.
  • Modern digital platforms offer interactive thesauri with advanced search features.

Thesauri vs. Thesauruses

The graph shows the occurances of the plural of thesaurus in written English since 1800 using Google's Ngram Viewer.



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The plural of thesaurus is thesauri or thesauruses
The plural of thesaurus is thesauri or thesauruses