toroid

1. Mathematics.
   1. A surface generated by a closed curve rotating about, but not intersecting or containing, an axis in its own plane.
   2. A solid having such a surface.
2. A body having the shape of a toroid.

[TOR(US) + -OID.]

The noun has 2 meanings:

Meaning #1: the doughnut-shaped object enclosed by a torus

Meaning #2: a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
  Synonym: torus

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Toroid may refer to

• Toroid (geometry), a doughnut-like solid whose surface is a torus.
• Toroidal inductors and transformers which have wire windings on circular ring shaped magnetic cores.
• Vortex ring, a toroidal flow in fluid mechanics.

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Common misspelling(s) of toroidal

• toriodal