[tawr-oid, tohr-]
noun Geometry.
a surface generated by the revolution of any closed plane curve or contour about an axis lying in its plane.
the solid enclosed by such a surface.

1895–1900; tor(us) + -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
toroid (ˈtɔːrɔɪd)
1.  geometry a surface generated by rotating a closed plane curve about a coplanar line that does not intersect the curve
2.  See also torus the solid enclosed by such a surface

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
toroid   (tôr'oid')  Pronunciation Key 
A surface generated by rotating a closed curve about an axis that is in the same plane as the curve but does not intersect it.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Air spinning in a toroid has low pressure at its center of rotation, which
  makes the toroid of air rise.
The toroid must be placed so as not to touch either diamond culet.
In the middle a toroid is seen edge on, revealing the hexagonal packing on the
  lower side and disordered packing on the top.
Compact toroid formation, compression, and acceleration.
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