Learn English – What does the suffix “-saurus” mean


Is it the same meaning in tyrannosaurus as in thesaurus?

I really can’t imagine what those two words could possibly have in common!

Best Answer

The two etymologies are different.

In thesaurus, the -saurus isn’t a suffix. It’s part of the word. The word actually comes from the Greek word thēsaurós, which means treasure or treasury.

In tyrannosaurus, the origin is from the Greek words turannos, which means tyrant, plus the word sauros, which means lizard.

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