Ring-shaped surface (5)
I believe the answer is:
torus
(Other definitions for torus that I've seen before include "Ring shaped like doughnut with hole" , "Doughnut-shaped solid" , "Ring shape" , "Ring-shaped object" , "Architectural moulding" .)
I believe the answer is:
torus
(Other definitions for torus that I've seen before include "Ring shaped like doughnut with hole" , "Doughnut-shaped solid" , "Ring shape" , "Ring-shaped object" , "Architectural moulding" .)