A book or electronic resource that lists the words of a language (typically in alphabetical order) and gives their meaning, or gives the equivalent words in a different language, often also providing information about pronunciation, origin, and usage. A thesaurus or synonym dictionary is a reference work for finding synonyms and sometimes antonyms of words.
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The Oxford English Dictionary (OED) is widely regarded as the accepted authority on the English language. It is an unsurpassed guide to the meaning, history, and pronunciation of 600,000 words— past and present—from across the English-speaking world.
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The Oxford English Dictionary (OED) is widely accepted as the most complete record of the English language ever assembled. Unlike typical language dictionaries, which only define words in terms of their current uses and meanings, the OED is a historical dictionary.
While the Oxford English Dictionary gives you the meaning of the word as well as its origin, the Cambridge Dictionary gives a more practical explanation along with an example of how to use the word in a sentence.
As with other word that have stayed largely unchanged from their origin in Greek or Latin, the Latin pluralization is correct, thesauri. However, as with other words that have been adopted into the English language for centuries, the English pluralization is also correct, thesauruses.
A thesaurus is a book that lists words or phrases that mean the same thing or almost the same thing–a book of synonyms. Some thesauruses list words in alphabetical order, just like a dictionary; however, many don't. They have an index at the front, with instructions of how to use the index to find the word you want.
According to Merriam-Webster, the English word thesaurus comes from the Greek thesaurus, which means “treasure.” The word was once used to describe places that housed a large collection of valuables. If you ask writers about the thesaurus today, they will likely talk about its usefulness