Crossword Genius

Doughnut, mathematically (5)

Ross

I believe the answer is:

torus

'doughnut mathematically' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for torus that I've seen before include "Shape of doughnut" , "Architectural moulding" , "Ring shaped like doughnut with hole" , "Ring-doughnut shape" , "Ring-shaped object" .)

I've seen this clue in the LA Times and the USA Today.
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