Crossword Genius

A closed conic section shaped like a flattened circle (7)

Ross

I believe the answer is:

ellipse

(Other definitions for ellipse that I've seen before include "Sell pie off for a geometric figure" , "Inclined plane through a cone" , "See pill (anag) - oval" , "Conic section" , "Regular oval shape" .)

I've seen this clue in The Independent.
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