thesaurus

From Wiktionary
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Pronunciation[change]

Noun[change]

Singular
thesaurus

Plural
thesauruses or thesauri

  1. (countable) A thesaurus is a book which lists synonyms (different words which have the same meaning).
    A thesaurus usually groups together synonymous words such as schadenfreude and epicaricacy together under a single heading.