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
13 more definitions
Top Definition
A scholarly dinosaur known worldwide for his knowledge of words of all kind.
The brachiosaurus consulted the wise Thesaurus upon synonyms of "extinct".
by Mickey Mouse June 18, 2003
The smartest dinosaur known to man.
Einstein: E=MC2
Thesaurus: Duh
by King of the Oregon Trail October 09, 2007
THE ONE dinosaur who was so "the shit", that he needed no prefix.
Daaaaym, THEsaurus is so the shit!

Rar.
by Craptoidilus February 23, 2008
A big book that college kids use to sound smart when they have nothing relevant to say.
"Hey, what's another word for marginalize?"
"I don't know... look it up in the thesaurus!"
by Wallbridge June 28, 2006
1. A major source of humour for anyone who has really nothing at all to do.
2. A dinosaur? Possibly.
3. A book which contains synonyms. Ironically, the word "thesaurus" has no synonyms.
1. Hey, apparently, "dice" is a synonym for "frangepanni" and "frangepanni" is a synonym of "bad spelling"!
2. (see the entry for "Thesaurus" below...)
3. z0mg, ROFLMFAO!!!!
by Whittsnake November 15, 2005
Another book much like a dictionary, but is used to find words that mean the same things as other, in other words used to find words synonyms.
"I used a thesaurus? to look up fag, and found the name Jonas."
by Fabio Sisparro November 28, 2006
The only dinosaur that could read.
The thesaurus read a bed time story to his little dinos.
by Soccer10Kid October 26, 2010

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