A thesaurus is a reference work that lists words grouped together according to similarity of meaning (containing synonyms and sometimes antonyms), in contrast to a dictionary, which contains definitions and pronunciations.

The largest thesaurus in the world is the Historical Thesaurus of the Oxford English Dictionary, which contains more than 920,000 entries.
Girl at library: Excuse me, where is the thesaurus found here?

Librarian: It's at the "reference" or the "non-fiction" section.

Girl: OK, thank you~
by Final Fantasy DUNDUNDUN October 06, 2011
Get the mug
Get a Thesaurus mug for your Facebook friend José.
A little-known, but extremely intelligent dinosaur that survived the extinction of the dinosaurs by hiding in Hogwarts with the dragons.
Thesauruses are the ninjas of the book world.
by Someone Average March 23, 2012
Get the mug
Get a Thesaurus mug for your guy Manley.
A girl who is "loose". A female who gets around..
Counters the male equivalent of Dictionary.
that girl is a thesaurus
by The Backdoor Joel September 25, 2010
Get the mug
Get a thesaurus mug for your Facebook friend José.
A very difficult word to pronounce. Usually ends up 'thathauruth' or a variant of it. However, one can easily overcome this obstacle by pronouncing the word very slowly. See thathafrath.
Alex: Hey, could you hand me the thethaur-... theth-.. the thing next to the dictionary?
John: The thesaurus?
Alex: ... yeah.
by AlexOfSpades November 18, 2014
Get the mug
Get a Thesaurus mug for your cousin Julia.