
1) Annulus 2) Anulus 3) Doughnut 4) Torus
Found on
https://www.crosswordclues.com/clue/toroid

1) Bagel shape 2) Circular tube 3) Donut-shaped 4) Donut-shaped tube 5) Donut, mathematically 6) Doughnut shape 7) Doughnut-shaped 8) Doughnut-shaped figure 9) Doughnut-shaped object 10) Doughnut, geometrically 11) Ring-shaped surface 12) Solid 13) Solid like a bagel 14) Tire tube
Found on
https://www.crosswordclues.com/clue/toroid

- the doughnut-shaped object enclosed by a torus
- a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
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In mathematics, a toroid is a doughnut-shaped object, such as an O-ring. It is a ring form of a solenoid. Its annular shape is generated by revolving a plane geometrical figure about an axis external to that figure which is parallel to the plane of the figure and does not intersect the figure. When a rectangle is rotated around an axis parallel to...
Found on
http://en.wikipedia.org/wiki/Toroid

shaped like a doughnut or anchor-ring
Found on
http://phrontistery.info/t.html

A device used to measure beam current in an accelerator; so named because it uses a toroidal winding on a core as a pickup.
Found on
http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A

[
n] - the doughnut-shaped object enclosed by a torus
Found on
http://www.webdictionary.co.uk/definition.php?query=toroid
No exact match found.