Crossword Genius

Curved shape different outside boundary (7)

Ross

I believe the answer is:

ellipse

(Other definitions for ellipse that I've seen before include "Inclined plane through a cone" , "Figure like flattened circle" , "Sell pie badly to get a geometrical figure" , "Egg-shaped geometrical figure" , "Shape - sell pie (anag)" .)

I've seen this clue in The Sun.
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