Crossword Genius

So-called "father of geometry" (6)

Ross

I believe the answer is:

euclid

(Other definitions for euclid that I've seen before include "Great Greek mathematician, notable for geometry" , "Greek mathematician, 3rd century BC" , "Greek philosopher" , "Old mathematician" , "Early Greek geometrician" .)

I've seen this clue in The New York Times.
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