Tera and Tyra: Similar Marvels or Different Monsters?

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SUMMARY

The metric prefix "tera" originates from the Greek word "teras," meaning "marvel" or "monster," while "tyra" in "tyrannosaur" derives from the Greek "tyrannos," meaning "tyrant." Despite their superficial similarities, the two terms are fundamentally different in meaning and origin. The association of "tyra" with monstrosity is incorrect, as it stems from the dinosaur's characteristics rather than the etymology of the word. According to the Etymonline dictionary, "tyra" is a loanword, whereas "teras" is a native Greek term, reinforcing their distinct origins.

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Orthoceras
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The metric prefix "tera" comes from the Greek word teras or teratos, meaning "marvel, monster", whereas "tyra" in tyrannosaur is derived from tyrant. Tera and tyra seem to have a somewhat similar original meaning, are they perhaps essentially the same?
 
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Seems unlikely. The Greek tyrannos means absolute ruler, not a monster. Associating the monstrous meaning because, arguably, tyrannosaurus was monstrous is putting the cart before the horse - the dinosaur doesn't retroactively affect the meaning of the original word.
Furthermore, the etymonline dictionary lists it as a loanword, whereas teras is native. So unless there was an earlier split from a common root the words should be unrelated and merely superficially similar.
 
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