Penta- minus two (3)

I believe the answer is:

tri

(Other definitions for tri that I've seen before include "Three-point" , "Denotes three" , "Prefix meaning three" , "Prefix indicating three" , "Prefix denoting three" .)

I've seen this clue in the Newsday.com, the L.A. Times Daily, the Newsday and the Universal.

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