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2.
a dinosaur who doesnt attack people, only bombards you with words that all have the same meaning until you kill yourself.

watch out. very dangerous

That thesaurus rex almost synonymed me to death.
by ojpimpjuice69 April 08, 2009
 
1.
A person who uses a word program or internet thesaurus in order to make their papers or written works appear smarter by replacing common words with larger or uncommon words.
The phrontistery is a Thesaurus Rex's wet dream.

"Since when does Bismark use the word jackanapes?"
"Since he became a Thesaurus Rex."
by Chromium April 02, 2006