Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A surface generated by a closed curve (especially a circle) rotating about, but not intersecting or containing, an axis in its own plane.
  • n. A ring-shaped object whose surface is a torus.

from The Century Dictionary and Cyclopedia

  • Same as toroidal.
  • n. A surface or solid of revolution determined by revolving any closed-plane contour about an axis in its plane which does not intersect it.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle
  • n. the doughnut-shaped object enclosed by a torus

Etymologies

tor(us) + -oid.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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