Crossword Genius

Moulding, in a shape seen in some gothic arches (4)

Ross

I believe the answer is:

ogee

(Other definitions for ogee that I've seen before include "S-shaped moulding" , "bit of Gothic architecture?" , "S-shaped line" , "architectural feature" , "Leer" .)

I've seen this clue in The Times and The Sunday Times.
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