Tyrannosaurus ____ (3)

I believe the answer is:

rex

(Other definitions for rex that I've seen before include "Part of official title of a king" , "King - Harrison?" , "Dog's name; king" , "King's title" , "See 6" .)

I've seen this clue in the LA Times, The New York Times, the Newsday, the USA Today, The Star Tribune and the Universal.

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