Crossword Genius

Curved structure (4)

Ross

I think it could be either:

dome

arch

'curved structure' is the definition.
(architectural structure)

This is the entire clue.

(Other definitions for arch that I've seen before include "Inner side of foot" , "Supporting structure" , "Curve that spans an opening" , "Bend into upward curve" , "Devilish" .)

I've seen this clue in The Telegraph, the USA Today, the Evening Standard, the Sydney Morning Herald, The Independent, The Guardian, the LA Times, The Mirror, The Sun, The Times and The Washington Post.
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