torus
- n a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
- n commonly the lowest molding at the base of a column
- The central horizontal torus (scientific word for a doughnut shape) is a ring-shaped aluminum vacuum chamber with a 39-in.
- Construction from a Ring (1940-41) is a fat torus or ring sliced in half and then set up with one half balanced on the other.
- There's a subplot in this one that deals with (IIRC) a near-weightless mass of air adrift in space (a bit like the torus in Niven's Integral Trees books) that supports a complex .