Curved structure (4)

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 Times, The Guardian, The Mirror, the Sydney Morning Herald, The Telegraph, the LA Times, the Evening Standard, The Sun, The Independent and the USA Today.

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