Does the Word ‘Dinosaur’ Really Mean “Terrible Lizard”?

When I was growing up, I always read and was taught in school that the word dinosaur comes from Greek roots that mean “terrible lizard.” This is how the current revision of the article “dinosaur” on Wikipedia translates the word also. This translation is not strictly incorrect, but it is not necessarily the most accurate translation either.

The English biologist and paleontologist Richard Owen coined the word dinosaur at a meeting for the British Association for the Advancement of Science in the year 1841 by combining the Greek adjective δεινός (deinós), which is usually translated as “terrible,” with the noun σαύρα (saúra), which means “lizard” or “reptile.”

The meaning of the word σαύρα is more-or-less straightforward, but the word δεινός is a bit more complicated than the simple translation of “terrible” might lead a person to believe. In some contexts, “terrible” is an adequate translation, but, unlike the English word terrible, which has exclusively negative meanings, δεινός can also have positive meanings. As such, “formidable” is probably a better translation of the word in general.

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